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. In spite of the sprained hip Jacob persevered in his struggle with the man, of whose identity he became surer every moment. It was the Lord Himself, in human form, who here assumed the role of an antagonist to Jacob, and for that reason Jacob insisted upon having His blessing before permitting Him to depart.