Jamieson, Fausset and Brown on Genesis 32:9-12

9-12. Jacob said, O God of my father Abraham--In this great emergency, he had recourse to prayer. This is the first recorded example of prayer in the Bible. It is short, earnest, and bearing directly on the occasion. The appeal is made to God, as standing in a covenant relation to his family, just as we ought to put our hopes of acceptance with God in Christ. It pleads the special promise made to him of a safe return; and after a most humble and affecting confession of unworthiness, it breathes an earnest desire for deliverance from the impending danger. It was the prayer of a kind husband, an affectionate father, a firm believer in the promises.