'Bowstrings' in the Bible

Samson said to her, "If they tie me up with seven fresh bowstrings that have not been dried, I will become weak and be just like any other man."

So the rulers of the Philistines brought her seven fresh bowstrings which had not been dried and they tied him up with them.

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.