Judges 16:9 in the King James Version
Now there were men lying in wait, abiding with her in the chamber. And she said unto him, The Philistines be upon thee, Samson. And he brake the withs, as a thread of tow is broken when it toucheth the fire. So his strength was not known.
Context
8 Then the lords of the Philistines brought up to her seven green cords which had not been dried, and she bound him with them.
9 Now she had an ambush waiting in the inner room. She said to him, “The Philistines are on you, Samson!” He broke the cords as a flax thread is broken when it touches the fire. So his strength was not known.
10 Delilah said to Samson, “Behold, you have mocked me, and told me lies. Now please tell me how you might be bound.”