God first made the promise to Abraham (Genesis 15:18–21):

On that day the Lord made a covenant with Abram and said, "To your descendants I give this land, from the Wadi of Egypt to the great river, the Euphrates— the land of the Kenites, Kenizzites, Kadmonites, Hittites, Perizzites, Rephaites, Amorites, Canaanites, Girgashites and Jebusites."

The Promised Land, Obama's new book, a memoir that discover history and give hope to the future. Looking forward to it, highly recommend.