Judges 16:17

That he told her all his heart, and said unto her, There hath not come a razor upon mine head; for I have been a Nazarite unto God from my mother’s womb: if I be shaven, then my strength will go from me, and I shall become weak, and be like any other man.

Cross-reference

Judges 13:5 establishes Samson's Nazarite vow and no-razor condition—here he reveals that secret, directly citing it.

Numbers 6:5 gives the Nazarite law: no razor on head—Samson's vow follows this law exactly.

Proverbs 12:23 says a prudent man conceals knowledge, contrasting Samson's foolish revelation of his secret to Delilah.

Micah 7:5 warns not to trust a close companion—Samson trusted Delilah, who lay in his bosom, and paid dearly.

Proverbs 29:11 says a fool utters all his mind—Samson told Delilah everything, acting foolishly.