Judges 13:21

But the angel of the Lord was seen no more by Manoah and his wife. Then it was clear to Manoah that he was the angel of the Lord.

Judges 6:22

Then Gideon was certain that he was the angel of the Lord; and Gideon said, I am in fear, O Lord God! for I have seen the angel of the Lord face to face.

Judges 13:16

And the angel of the Lord said to Manoah, Though you keep me I will not take of your food; but if you will make a burned offering, let it be offered to the Lord. For it had not come into Manoah's mind that he was the angel of the Lord.

Hosea 12:4-5

He had a fight with the angel and overcame him; he made request for grace to him with weeping; he came face to face with him in Beth-el and there his words came to him;

Treasury of Scripture Knowledge

Summary

But the angel of the LORD did no more appear to Manoah and to his wife. Then Manoah knew that he was an angel of the LORD.

Bible References

Knew

Judges 6:22
Then Gideon was certain that he was the angel of the Lord; and Gideon said, I am in fear, O Lord God! for I have seen the angel of the Lord face to face.
Hosea 12:4
He had a fight with the angel and overcame him; he made request for grace to him with weeping; he came face to face with him in Beth-el and there his words came to him;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain