The interpretation timeline
Judges 6:20 Douay-Rheims

And the angel of the Lord said to him: Take the flesh and the unleavened loaves, and lay them upon that rock, and pour out the broth thereon. And when he had done so,

A.D. 397 – 1849 4 witnesses

Patristic

before A.D. 750
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“And Gideon, moved by that message, when he heard that, though thousands of the people failed, God would deliver His own from their enemies by means of one man, offered a kid, and according to the word of the Angel, laid its flesh and the unleavened cakes upon the rock, and poured the broth upon them. And as soon as the Angel touched them with the end of the staff which he bore, fire burst forth out of the rock, and so the sacrifice which he was offering was consumed. By which it seems clear that that rock was a figure of the Body of Christ, for it is written: "They drank of that rock that followed them, and that rock was Christ." Which certainly refers not to His Godhead, but to His Flesh, which watered the hearts of the thirsting people with the perpetual stream of His Blood. Even at that time was it declared in a mystery that the Lord Jesus in His Flesh would, when crucified, do away the sins of the whole world, and not only the deeds of the body, but the desires of the soul. For the flesh of the kid refers to sins of deed, the broth to the enticements of desire as it is written: "For the people lusted an evil lust, and said, Who shall give us flesh to eat?" That the Angel then stretched forth his staff, and touched the rock, from which fire went out, shows that the Flesh of the Lord, being filled with the Divine Spirit, would burn away all the sins of human frailty. Wherefore, also, the Lord says: "I am come to send fire upon the earth."”
Source
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“"But I say unto you, that whosoever looketh on a woman to lust after her, hath committed adultery with her already in his heart." "The humour," therefore, "is wiped off," when sin is not only severed from the deed, but also from the thought. It is hence that Jerubbaal saw the Angel when he was winnowing corn from the chaff, at whose bidding he forthwith dressed a kid and set it upon a rock, and poured over it the broth of the flesh, which the Angel touched with a rod, and thereupon fire coming out of the rock consumed it. For what else is it to beat corn with a rod, but to separate the grains of virtues from the chaff of vices, with an upright judgment? But to those that are thus employed the Angel presents himself, in that the Lord is more ready to communicate interior truths in proportion as men are more earnest in ridding themselves of external things. And he orders a kid to be killed, i.e. every appetite of the flesh to be sacrificed, and the flesh to be set upon a rock, and the broth thereof to be poured upon it. Whom else does the "rock" represent, saving Him, of Whom it is said by Paul, "And that rock was Christ"? We "set flesh then upon the rock," when in imitation of Christ we crucify our body. He too pours the juice of the flesh over it, who, in following the conversation of Christ, empties himself even of the mere thoughts of the flesh themselves. For "the broth" of the dissolved flesh is in a manner "poured upon the rock," when the mind is emptied of the flow of carnal thoughts too. Yet the Angel directly touches it with a rod, in that the might of God's succour never leaves our striving forsaken. And fire issues from the rock, and consumes the broth and the flesh, in that the Spirit, breathed upon us by the Redeemer, lights up the heart with so fierce a flame of compunction, that it consumes every thing in it that is unlawful either in deed or in thought.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Then the angel of the Lord put forth the end of the staff that was in his hand,.... With which he walked, appearing as a traveller, and which was one reason of Gideon's providing for his refreshment, before he proceeded on in his journey: and touched the flesh and the unleavened cakes; did not strike the rock with it, as Moses did with his rod, to fetch out water for the Israelites, but touched the provisions brought him; not using it instead of a knife to separate any part of them, but for the working of a miracle, as follows: and there rose up fire out of the rock; had he struck the rock with his staff, the miracle would not have appeared so great, because it might be thought there was an iron ferrule at the end of it, which striking on a flinty rock might cause fire; but it was the flesh and cakes only that were touched, and these also as having broth poured on them, and the rock likewise: and consumed the flesh, and the unleavened cakes; though they had the broth poured on them, and were sodden with it; so that the miracle was similar to that wrought by Elijah on Mount Carmel, Kg1 18:33, and those who think that this angel was the man, the prophet before mentioned, and he Phinehas, and Phinehas Elijah, are confirmed in their opinion by this likeness; though there is no sufficient ground for it: then the angel of the Lord departed out of his sight: not went on his journey, as he might seem, but vanished immediately; which circumstance plainly showed, and fully convinced Gideon, that he was not a man, but an angelic spirit, as well as the miracle wrought proved him to be more than a man; and so Gideon had what he desired, a sign that he might know who talked with him, and that what he talked of would certainly come to pass.”
Source
1849
A.D.
1774–1849
“Thereon. Thus he would shew Gedeon that he had no need of food. He would exercise his obedience, and manifest a greater miracle, as the flesh and bread would be less apt to take fire, when the angel touched them, even though some might imagine that he caused a spark to come from the rock. For the like purpose, Elias ordered thrice four buckets of water to be poured on the bullock, which fire from heaven would miraculously consume, 3 Kings xviii. 34. (Haydock) — This broth might serve to anoint the altar, (Exodus xl. 10.; Menochius) or answer instead of the usual libations. (A. Montan.)”
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.