The interpretation timeline
Joshua 5:11 Douay-Rheims

And they ate on the next day unleavened bread of the corn of the land, and frumenty of the same year.

1105 – 1871 5 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“From the day after the Pesach. This was the day of waving the Omer, for they sacrificed the Omer first. From the seventh day of Adar, the day when Moshe died, when the manna stopped falling, they were sufficiently supplied with the manna which was in their vessels which they gathered on the seventh of Adar, as it is said, ‘They ate the manna for forty years.’ But these forty years lacked thirty days— for the manna began to fall on the fifteenth day of Iyar. We must say therefore that in the [matzo] cakes the Bnei Yisroel took with them from Egypt, they tasted the taste of manna.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And they did eat the old corn of the land,.... That of the last year, as some versions (g), which agree with ours; in which they seem to follow the Jewish writers, who, as particularly Kimchi, Gersom, and Ben Melech, interpret it of the old corn, for this reason, because they might not eat of the new until the wave sheaf was offered up, Lev 23:10; of which old corn they suppose the unleavened cakes were made, and was also parched corn, though that word the Septuagint version translates "new"; and indeed were it not for the above law, there does not seem to be any reason for rendering it old corn, only corn of the land, as the Septuagint does; and there is some difficulty how they should get at the old corn, which it may be supposed was laid up in the granaries, when Jericho was close shut up, and none went in or out; unless they met with it in some of the villages near at hand, or it was brought them by the traders in corn, of whom they bought it, or found it in some houses and barns without the city: on the morrow after the passover; which Kimchi and Ben Gersom say was on the fifteenth of Nisan, the passover being on the fourteenth; but if the morrow after the passover is the same with the morrow after the Sabbath, Lev 23:11; that was the sixteenth of Nisan; and so Jarchi here says, this is the day of waving the sheaf, which was always done on the sixteenth: it is difficult to say which day is meant; if it was the sixteenth, then it may refer to what they ate on that day, after the sheaf was offered (h); if it was the fifteenth, it seems necessary to understand it of the old corn; and such they must have to make their unleavened cakes of, both for the passover on the fourteenth, and the Chagigah, or feast of unleavened bread, which began the fifteenth, as it follows: unleavened bread, and parched corn in the selfsame day; unleavened bread, for the uses before mentioned, they were obliged to, and parched corn for their pleasure; but new corn, as the Septuagint render it, was expressly forbidden before the waving of the sheaf, Lev 23:14; and therefore old corn seems to be meant; this was just forty years to a day from their coming out of Egypt. (g) "de frumento praeteriti anni", Montanus; sic, Munster, Tigurine version, Vatablus. (h) So in Seder Olam Rabba, c. 11. p. 31.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“They did eat of the old corn of the land - The Hebrew word עבור abur, which we translate old corn, occurs only in this place in such a sense, if that sense be legitimate. The noun, though of doubtful signification, is evidently derived from עבר abar, to pass over, to go beyond; and here it may be translated simply the produce, that which passes from the land into the hands of the cultivator; or according to Cocceius, what passes from person to person in the way of traffic; hence bought corn, what they purchased from the inhabitants of the land. On the morrow after the passover - That is, on the fifteenth day; for then the feast of unleavened bread began. But they could neither eat bread, nor parched corn, nor green ears, till the first-fruits of the harvest had been waved at the tabernacle; (see Lev 23:9, etc.); and therefore in this case we may suppose that the Israelites had offered a sheaf of the barley-harvest, the only grain that was then ripe, before they ate of the unleavened cakes and parched corn.”
Source
1849
A.D.
1774–1849
“Corn. Some pretend that the Hebrew means “old corn.” But the ancient interpreters take no notice of this restriction. The offering of corn was probably omitted on this occasion, as the Israelites had not cultivated the land. — Frumenty. Septuagint, “new corn.” Hebrew, “parched, on that same day.” These last words are taken by the Septuagint as a part of the next sentence.”
Source
1871
A.D.
1871
“And they did eat of the old corn of the land--found in storehouses of the inhabitants who had fled into Jericho. parched corn--new grain (see on Lev 23:10), probably lying in the fields. Roasted--a simple and primitive preparation, much liked in the East. This abundance of food led to the discontinuance of the manna; and the fact of its then ceasing, viewed in connection with its seasonable appearance in the barren wilderness, is a striking proof of its miraculous origin.”
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.