'Bowstrings' in the Bible

Then the Philistine lords brought her seven fresh cords that had not been dried, and she bound him with them.

Now she had men lying in ambush in an inner room. And she said to him, “The Philistines are upon you, Samson!” And he broke the cords as a string of tow breaks when it touches fire. So [the secret of] his strength was not discovered.