John Gill Commentary Judges 6:12

"And the angel of Jehovah appeared unto him, and said unto him, Jehovah is with thee, thou mighty man of valor." — Judges 6:12 (ASV)

And the angel of the Lord appeared to him
He stayed some time under the oak, and Gideon being busy in threshing, took no notice of him so he came and stood before him, in his sight:

and said to him, the Lord is with you ;
the gracious presence of God was with Gideon while he was threshing, who very probably was sending up ejaculations to heaven, on account of the distressed case of Israel, and was deep in meditation about the affairs of the people of God, and contriving how to deliver them; or the angel might mean himself, who was no other than Jehovah, the eternal Word of God, who was present with him, and spoke to him; and so the Targum,

``my Word is your help:''

you mighty man of valour ;
who very probably was a stout man in body, and of a courageous mind naturally, and might at this instant have an increase both of bodily strength and greatness of soul; or, however, this was said to animate and encourage him to do what he was about to be sent to do.