Judges 16:8-9

8So the lords of the Philistines brought up to her seven fresh bowstrings, not yet dried, and she bound him with them.

9Now men were lying in wait, staying with her in the room. And she said to him, “The Philistines are upon you, Samson!” But he broke the bowstrings as a strand of yarn breaks when it touches fire. So the secret of his strength was not known.