John Gill Commentary Genesis 32:26

"And he said, Let me go, for the day breaketh. And he said, I will not let thee go, except thou bless me." — Genesis 32:26 (ASV)

And he said, let me go, for the day breaketh This was said that he might seem to be a man that was desirous of going about his business, as men do early in the morning; though the true reason perhaps was, that his form might not be more distinctly seen by Jacob, and much less by any other person:

and he said, I will not let thee go except thou bless me ; for by his touching his thigh, and the effect of that, he perceived he was more than a man, even a divine Person, and therefore insisted upon being blessed by him: thus faith in prayer lays hold on God, and will not let him go without leaving the blessing it is pleading for; which shows the great strength of faith, and the efficacy of the prayer of faith with God; see (Exodus 32:10) (Isaiah 62:7) (James 5:15James 5:16) .