Parallel
Judges 16:9
Brenton's English Septuagint · Berean Standard Bible
And the liers in wait remained with her in the chamber; and she said to him, The Philistines [are] upon thee, Sampson: and he broke the cords as if any one should break a thread of tow when it has touched the fire, and his strength was not known.
While the men were hidden in her room, she called out, “Samson, the Philistines are here!” But he snapped the bowstrings like a strand of yarn seared by a flame. So the source of his strength remained unknown.