John Gill Commentary Judges 16:12

"So Delilah took new ropes, and bound him therewith, and said unto him, The Philistines are upon thee, Samson. And the liers-in-wait were abiding in the inner chamber. And he brake them off his arms like a thread." — Judges 16:12 (ASV)

Delilah therefore took new ropes, and bound him therewith ,
&c.] Tried this experiment with him, according to his directions, being very desirous of getting the sum of money offered her:

and said unto him, the Philistines be upon thee, Samson :
using the same words, and with the same view as she had done before, (Judges 16:9)

(and there were liers in wait abiding the chamber) ;
as before, ready upon occasion to rush in upon him, as soon as any notice was given them:

and he brake them from off his arms like a thread ;
as easily as a thread of linen can be snapped asunder.