Genesis 15:5-7

Then He brought him outside and said, “Look now toward heaven, and count the stars if you are able to number them.” And He said to him, “So shall your descendants be.” And he believed in the LORD, and He accounted it to him for righteousness. Then He said to him, “I am the LORD, who brought you out of Ur of the Chaldeans, to give you this land to inherit it.”