A prophet - His name is not given. (Compare 1 Kings 13.) This message is somewhat similar to that of the Angel, Judges 2:1-3. The reference to Exodus 20:2 is plain, and supposes the people to whom the prophet addresses these words to be familiar with the facts recorded in that text.
Related Commentaries of Judges 6:8
Judges 6:8
8 That the LORD sent a prophetb unto the children of Israel, which said unto them, Thus saith the LORD God of Israel, I brought you up from Egypt, and brought you forth out of the house of bondage;