Judges 16:8-9

16:8 So the rulers of the Philistines brought her seven fresh bowstrings which had not been dried and they tied him up with them. 16:9 They hid in the bedroom and then she said to him, “The Philistines are here, Samson!” He snapped the bowstrings as easily as a thread of yarn snaps when it is put close to fire. The secret of his strength was not discovered.