Judges 6:21 - Coke's Commentary on the Holy Bible

Then the angel—put forth the end of the staff, &c.— This divine person, appearing, most probably, in the form of a traveller, with a staff in his hand, just touched the cakes and the flesh, &c. with that staff, when immediately fire arose up out of the rock and consumed them: a miracle, no doubt, as great as if fire had come down from heaven, as on the sacrifices which Moses, Elijah, and others offered. Thus the faith of Gideon was confirmed; he had no doubt of the Divinity of the person who appeared, and he placed an absolute reliance on his promises. It is said at the close of this verse, that the angel of the Lord departed out of his sight; but it is evident from the subsequent verses, that Gideon still stood before, and conversed with him. We must therefore suppose, that, though no longer visible, the Lord made Gideon know that he was still present with him, by speaking in an audible voice. With respect to the next verse, see Genesis 16:13.