The cords ... became as flax ... - i. e. were as weak against his strength as half-burned flax which yields to the least pressure.
Related Commentaries of Judges 15:14
Judges 15:14
14 And when he came unto Lehi, the Philistines shouted against him: and the Spirit of the LORD came mightily upon him, and the cords that were upon his arms became as flax that was burnt with fire, and his bands loosedc from off his hands.