Genesis 32:26

Let me go... — Heb., send me away, for the gleam of morning has gone up. The asking of permission to depart was the acknowledgment of defeat. The struggle must end at daybreak, because Jacob must now go to do his duty; and the wrestling had been for the purpose of giving him courage, and enabling him to meet danger and difficulty in the power of faith. A curious Jewish idea is that the angel was that one whose duty it was to defend and protect Esau. By the aid of his own protecting angel Jacob, they say, had overpowered him, and had won the birthright and the precedence as “Israel, a prince with God and man.”

Except thou bless me. — The vanquished must yield the spoil to the victor; and Jacob, who had gradually become aware that the being who was wrestling with him was something more than man, asks of him, as his ransom, a blessing.