The interpretation timeline
Exodus 16:14 Douay-Rheims

And when it had covered the face of the earth, it appeared in the wilderness small, and as it were beaten with a pestle, like unto the hoar frost on the ground.

A.D. 45 – 1832 5 witnesses

Patristic

before A.D. 750
45
A.D.
c. 15 B.C.–A.D. 45
“LX. There is a certain peculiarity which is attached to this word. For when it calls the soul to itself, it excites a congealing power in everything which is earthly, or corporeal, or under the influence of the external senses. On which account it is said to be " like the hoar-frost on the earth." f For when the man who beholds God, meditates a flight from the passions, " the waves are frozen," that is to say, the impetuous rush, and the increase, and the haughty pride of the waves are arrested, in order that he who might behold the living God might then pass over the passion. J Therefore the Exodus xvi. 13. f Exodus vi. 16. % Exodus xvL 15. souls inquire of one another, those, that is, that have clearly felt the influence of the word, but which are not able to say what it is. For very often, when sensible of a sweet taste, we are nevertheless ignorant of the flavour which has caused it, and when we smell sweet scents, we still do not know what they are. And in the same manner also the soul very often, when it is delighted, is yet unable to explain what it is that has delighted it ; but it is taught by the hierophant and prophet Moses, who tells it, "This is the bread, the food which God has given for the soul," explaining that God has brought it, his own word and his own reason; for this bread which he has given us to eat is this word of his.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
ותעל שכבת הטל וגו׳ AND WHEN THE LAYER OF DEW WENT UP etc. — When the sun rose the dew which was lying upon the Manna ascended sunward, as is the manner of dew — that it ascends sunward; even if you were to fill an egg-shell with dew and close up its opening and place it in the sun, it (the egg-shell with the dew in it) will rise of its own accord into the air, (in consequence of the tendency of the dew to rise upwards). — But our Rabbis explained that these words imply that the dew rose from the ground into the air. — When the layer of dew went up the Manna became visible, and they looked, (cf. Midrash Tanchuma, Beshalach 20; Shemot Rabbah 38:4) והנה על המדבר דק AND BEHOLD, UPON THE SURFACE OF THE DESERT there was etc. דק, a THIN object, מחספס uncovered — and there is no other example of this word in the Scriptures. One may also explain מחספס as having the same meaning as חפיסה in (Mishna Bava Metzia 1:8) חפיסה ודלוסקמא, “a valise and chest”, in Mishnaic Hebrew, and the meaning would be, that when it became uncovered from the layer of dew they saw that there had been a thin object enclosed in it i. e. enclosed between the two layers of dew. Onkelos translates it by מקלף peeled (flaky), taking מחספס in the sense of, and from a similar root as, (Genesis 30:37) “peeling off (מחשף) the white”. ככפר AS HOAR FORST — כפר is old French gelide. The Targum renders דק by דעדק כגיר, the word גיר occurring in (Isaiah 27:9) “גיר-stones” — this is a kind of black colour — just as we enumerate amongst the kinds of earth which may be used for covering the blood of a wild animal or bird after it has been slaughtered “powdered chalk (גיר) and orpiment” (Chullin 88b). Onkelos renders the entire phrase by “powdered like גיר, like hoar-frost upon the ground”, meaning that it was as fine as גיר and lay congealed as frost in the ground. This is therefore the meaning of דק ככפור: “spread out fine but yet one atom hanging to another like hoar-frost”. דק is old French tenuis — meaning that it formed a thin incrustation on top. The word וכגיר which Onkelos has in his translation is an addition to the Hebrew text, there being no word corresponding to it in the verse.”
Source
1270
A.D.
Ramban Jewish
1194–1270
“DAK’ (A FINE) ‘MECHUSPAS’ (PEELED THING). In the opinion of Onkelos, [who translated the word mechuspas as meaning “peeled,” the word] is associated with the expressions: ‘machsoph’ (streaks making bare) the white; ‘chasaph hashem’ (the Eternal hath made bare) His holy arm. The letter sin [in the words machsoph and chasaph] is interchanged for the letter samach [in the word mechuspas], and the second root-letter of the verb [chasaph] of the verb.” Following the theory of Dunash ben Labrat, the great Hebrew grammarian of the tenth century, we call the three letters of the root of any verb by the names of the three letters of the Hebrew ‘po’al’ (verb) [which is spelled pei, ayin and lamed]. Thus the first letter of any verb is called the pei of the verb, the second is called the ayin, the third is called the lamed. In the verb chasaph before us, the second root-letter is the sin or its interchange, the samach, as explained in the text. In the word mechuspas, the samach appears twice. This then is the meaning of Ramban’s saying, “and the ayin (second letter) of the verb is doubled.” is doubled, [thus making it mechuspas]. DAK’ (FINE) ‘KAK’PHOR’ (AS THE HOAR-FROST). K’phor is the covering [of minute ice-particles] upon the ground in cold weather. It is similar in usage to the expression, He scattered ‘k’phor’ (hoar-frost) like ashes. Now Onkelos rendered [the Hebrew dak kak’phor al ha’aretz] into Aramaic thus: da’adak k’gir kig’lida al ar’a. On this, Rashi wrote [as an interpretation of Onkelos, that the word gir occurs in the expression], “as stones of ‘gir,’ which is a kind of black color. This is just as we say in connection with the covering of the blood [of a slaughtered wild animal or fowl, which the Torah specified must be done with earth. The Rabbis enumerate amongst the kinds of earth that can be used]: ‘gir (powdered chalk) and arsenic (or orpiment).’ [Onkelos’ Aramaic rendition da’adak k’gir kig’lida al ar’a thus means:] ‘thin [and brittle] like powdered chalk, and lying congealed as frost on the ground.’ And this is the meaning of the Hebrew dak kak’phor: spread out fine and connected like hoar-frost. Dak means that there was a thin incrustation on top. And that which Onkelos translated, k’gir (as powdered chalk), is an addition to the Hebrew text, there being no word corresponding to it in the verse.” [These are the words of Rashi.] But all this is not correct. Gir [is not a kind of black color, as Rashi wrote, but instead it] is a white earth which sticks to stone, and when crushed, it is used as plaster upon walls. It is very white and is better for the plastering of walls than lime, [which does not have the admixture of that white earth]. And so it is written, upon the ‘gira’ (plaster) of the wall of the king’s palace. This is why the manna which was white and spread out upon the earth could be associated with that crushed white earth. Onkelos then translated the Hebrew word k’phor in two ways. First, he derived it from the expression, and thou shalt pitch it within and without ‘bakopher’ (with pitch). Hence, he said k’gir (as the white earth) with which [the stones] are fastened and covered. Then he derived it also from the expression, He scattered ‘k’phor’ like ashes, which is the covering of minute ice needles which form in a cold atmosphere, just as he translated [the Hebrew] ‘v’kerach’ (and the frost) by night,, 31:40. “ug’lida (and frost) came down upon me at night.” in Onkelos’ translation has no corresponding word in the Hebrew text. According to Ramban, both Aramaic words, k’gir and kig’lida (“as powdered white earth” and “as frost”), are two renditions of the one Hebrew word kak’phor. Such was Onkelos’ style, to give two translations of one Hebrew word. The word can be used in the plural [g’lidin], (ices have sorrounded me), a metaphoric expression of a person describing that the hairs of his mustache and beard have turned gray (Rashi, ibid.) while the singular is called g’lid (ice), just as we have been taught in the Mishnah in Mikvaoth: “These are the things which only serve to fill up the immersion-pool [to its prescribed measure of forty s’ah] and do not render it invalid: snow, hail, hoar-frost, v’hag’lid (and ice).” And so indeed does Onkelos translate many Scriptural texts in two ways. But in carefully-edited texts of Targum Onkelos, it is written, da’adak d’gir, as we have assumed the reading in Onkelos to be until now. The reading of k’gir had forced Ramban to interpret that Onkelos simultaneously used two different translations of the Hebrew word kak’phor, namely, “as powdered white earth” and “as frost,” as explained above. This is clearly a difficult position. But with this present reading in Onkelos — d’gir, which means a heap — the Aramaic text leads to one unified thought: the manna was piled up in heaps as ice upon the earth. kig’lida al ar’a, and the meaning thereof is that the manna was piled up in heaps as ice upon the earth. This is the truth, for if [the word k’gir in the Targum] were of the root gir (powdered white earth or plaster), as we assumed at first], the Aramaic translation should have been: k’gira d’g'lida (as the powdered flakes of the ice), [and not, as we have it, k’gira ‘kig’lida], for such is the style of the Aramaic language. (“as” ice), and not d’g'lida (“of” the ice), it shows that the antecedent word is d’gir (a heap) and not k’gir (as powdered white earth). Thus the thought conveyed by the Targum is that the manna lay powdered in heaps as ice upon the ground.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And when the dew that lay was gone up,.... Exhaled by the sun upon the rising of it: behold, upon the face of the wilderness; upon the surface of it, all around the camp of Israel: there lay a small round thing, as small as the hoar frost on the ground; which is what is in the next verse called "manna". Before the sun rose there was nothing but a dew to be seen; when that was gone off through the force of the sun, then the manna appeared; which was but a "small thing", and very unpromising for food, and especially for such a vast number of people; and a "round" thing, for which it is after compared to a coriander seed, as is thought; though the Targums of Onkelos and Jonathan do not interpret the word of the round form, but rather refer to its smallness; and which is expressed in the Vulgate Latin version,"small, and as if beat with a pestle;''and for its white colour, as well as its smallness, it looked like hoar frost on the ground. Jarchi says there were two dews, within which it lay as something covered in a box, and he seems to be right; for it is certain from Num 11:9, that there was a dew which fell first, and then the manna fell upon it; and from hence it is plain also, that there was a dew over the manna, which went up from it when the sun rose: and the design of this seems to be to keep this heavenly bread pure and clean for the Israelites, that it might neither partake of the dust nor sand of the wilderness where it fell, and that nothing might light upon it until the time of gathering it came. The Jews, in memory of this, will sometimes put bread upon the table between two table cloths (n); and it is highly probable, that to this the allusion is of the "hidden manna" in Rev 2:17, by which is meant our Lord Jesus Christ, the antitype of this manna, as will be observed as we pass on, in all the circumstances of it; the manna came with the dew, and was covered with it, and hid in it; Christ is the gift of God's free grace to the sons of men, and is exhibited in the word of grace, where he lies hid to men in the glory of his person and the fulness of his grace, until revealed and made known. The figure of the manna being "round", which is a perfect figure, may denote the perfection of Christ in his person, natures, and office; he being perfectly God and perfectly man, having all the essential perfections both of the divine and human natures in him, as well as all fulness of grace; and being made perfect through sufferings, is become a complete Saviour, and by his blood, righteousness, and sacrifice, has perfected for ever his sanctified ones: and the manna being "small", may signify the meanness of Christ in the eyes of men in his state of humiliation, and the unpromising appearance he made of being the Saviour and King of Israel; the white colour of it may direct to the purity of Christ, to the holiness of his natures, and the beauty of his person, being white and ruddy, the chiefest among ten thousands. (n) Vid. Fagium in loc.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Behold, upon the face of the wilderness there lay a small round thing - It appears that this small round thing fell with the dew, or rather the dew fell first, and this substance fell on it. The dew might have been intended to cool the ground, that the manna on its fall might not be dissolved; for we find from Exo 16:21, that the heat of the sun melted it. The ground therefore being sufficiently cooled by the dew, the manna lay unmelted long enough for the Israelites to collect a sufficient quantity for their dally use.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.