The interpretation timeline
1 Samuel 16:7 Douay-Rheims

And the Lord said to Samuel: Look not on his countenance, nor on the height of his stature: because I have rejected him, nor do I judge according to the look of man: for man seeth those things that appear, but the Lord beholdeth the heart.

A.D. 215 – 1849 7 witnesses

Patristic

before A.D. 750
215
A.D.
c. A.D. 150–215
“They have gone beyond the limits of impropriety. They have invented mirrors to reflect all this artificial beautification of theirs, as if it were nobility of character or self-improvement. They should, rather, conceal such deception with a veil. It did the handsome Narcissus no good to gaze on his own image, as the Greek myth tells us. If Moses forbade his people to fashion any image to take the place of God, is it right for these women to study their reflected images for no other reason that to distort the natural features of their faces?In much the same way, when Samuel the prophet was sent to anoint one of the sons of Jesse as king, and when he brought out his chrism as soon as he saw the oldest son, admiring his handsomeness and height, Scripture tells us, "The Lord said to him: 'Look not on his countenance, nor on the height of his stature, because I have rejected him. For man sees those things that appear, but the Lord beholds the heart.' " He finally anointed not the one who was fair in body but the one who was fair of soul. If the Lord places more importance on beauty of soul than on that of the body, what must he think of artificial beautification when he abhors so thoroughly every sort of lie? "We walk by faith, not by sight."”
Source
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“You are human, and so you know other people only from the outside. You think as you see, and you see only what your eyes let you see. But "the eyes of the Lord are lofty." "Man looks on the outward appearance, God looks on the heart." So "the Lord knows them that are his" and roots up the plant which he has not planted. He shows the last to be first, he carries a fan in his hand to purge his floor. Let the chaff of light faith fly away as it pleases before every wind of temptation. So much the purer is the heap of wheat which the Lord will gather into his garner.”
Source
389
A.D.
A.D. 329–390
“Do not say, "I do not mind a mere priest, if he is a celibate, and a religious [person], and of angelic life; for it would be a sad thing for me to be defiled even in the moment of my cleansing." Do not ask for credentials of the preacher or the baptizer. For another is his judge and the examiner of what you can't see. For humans look on the outward appearance, but the Lord looks on the heart.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“Do not look at his appearance. Upon the beauty of his stature. For I have rejected him. Because he is a quick tempered person, as it is stated, 'And Eliov became angry with Dovid.' For it is not as man perceives it. Even though you called yourself a seer, when you said to Shaul, 'I am the seer,' here I am informing you that you do not see.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“But the Lord said to Samuel,.... By a secret impulse upon his mind, as if he had spoken with an articulate voice to him: look not on his countenance; which was comely and majestic: or on the height of his stature; which was like that of Saul's; and because the Lord had chosen him, who was superior to the people in this respect, Samuel thought he meant to have such an one now anointed king: because I have refused him; or it is not my pleasure that he should be king; though Ben Gersom thinks this refers to Saul, that the Lord had rejected him, though of an high stature, and therefore Samuel should not look out for such a person to be king; and Abarbinel refers it to the height of stature itself, that God had rejected that, and laid it aside as a qualification of a king, or as a rule to judge of a proper person to be a king; but no doubt it respected Eliab: for the Lord seeth not as man seeth; man only sees what is without, but the Lord sees what is within; only the outward visible form of the body is seen by man, but the inward qualifications and endowments of the mind are seen by the Lord: for man looketh on the outward appearance; the comeliness of a man's person, the majesty of his countenance, the height of his stature, and size of his body, things which recommended men to be kings among the nations of the world; See Gill on Sa1 9:2, or "to the eyes" (a); the liveliness, and briskness, and sharpness of them, thereby to judge of the sagacity and penetration of the mind, as physiognomists do; who guess at the disposition of men by them, when they are small or great, watery or dry, of this or the other colour (b): but the Lord looketh on the heart; and knows what is in that, what wisdom and prudence, justice and integrity, mercy and goodness, and other princely qualifications are in that. The Jewish writers conclude from hence that the heart of Eliab was not right; it may be, full of wrath, pride, envy, &c. which disqualified him for government. (a) "ad oculos", Montanus. (b) Vid. Schotti Thaumaturg. Physic. par. 4. l. 7. c. 8.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Man looketh on the outward appearance - And it is well he should, and confine his looks to that; for when he pretends to sound the heart, he usurps the prerogative of God. In what way were these communications made from God to Samuel? It must have been by direct inspirations into his heart. But what a state of holy familiarity does this argue between God and the prophet! I believe Moses himself was not more highly favored than Samuel.”
Source
1849
A.D.
1774–1849
“Rejected, or not chosen. (Menochius) — God had positively rejected this eldest son, as his pride seems to have been the greatest, chap. xvii. 28. (Haydock) — Heart. This is one of God’s perfections. Glorified saints see man’s heart in his light, for their own and our advantage, (St. Gregory, Mor. xii. 11.; St. Augustine) as the prophets have sometimes done, 3 Kings xiv. (Worthington)”
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.