Judges 13:21

But the agent of LORD appeared no more to Manoah or to his wife. Then Manoah knew that he was the agent of LORD.

Judges 6:22

And Gideon saw that he was the agent of LORD. And Gideon said, Alas, O lord LORD! Inasmuch as I have seen the agent of LORD face to face.

Judges 13:16

And the agent of LORD said to Manoah, Though thou detain me, I will not eat of thy bread, and if thou will make ready a burnt-offering, thou must offer it to LORD. For Manoah did not know that he was the agent of LORD.

Hosea 12:4-5

Yea, he had strength over the [heavenly] agent, and prevailed, [as] he wept, and made supplication to him. He found him at Bethel, and there he spoke with us.

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
And Gideon saw that he was the agent of LORD. And Gideon said, Alas, O lord LORD! Inasmuch as I have seen the agent of LORD face to face.
Hosea 12:4
Yea, he had strength over the [heavenly] agent, and prevailed, [as] he wept, and made supplication to him. He found him at Bethel, and there he spoke with us.