KJV:
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.
NASB:
Now she had men lying in wait in an inner room. And she said to him, "The Philistines are upon you, Samson!" But he snapped the cords as a string of tow snaps when it touches fire. So his strength was not discovered.