Judges 16:6-9

6So Delilah said to Samson, “Tell me the secret of your great strength and how you can be tied up and subdued.”

7Samson answered her, “If anyone ties me with seven fresh bowstrings that have not been dried, I’ll become as weak as any other man.” 8Then the rulers of the Philistines brought her seven fresh bowstrings that had not been dried, and she tied him with them.

9With men hidden in the room, she called to him, “Samson, the Philistines are upon you!” But he snapped the bowstrings as easily as a piece of string snaps when it comes close to a flame. So the secret of his strength was not discovered.