Judges 16:6-8

Young's Literal Translation

⁶ And Delilah saith unto Samson, `Declare, I pray thee, to me, wherein thy great power [is], and wherewith thou art bound, to afflict thee.'

⁷ And Samson saith unto her, `If they bind me with seven green withs which have not been dried, then I have been weak, and have been as one of the human race.'

⁸ And the princes of the Philistines bring up to her seven green withs which have not been dried, and she bindeth him with them.