Genesis 15:5-7

And he brought him forth abroad, and said, Look now toward heaven, and number the stars, if thou be able to number them: and he said unto him, So shall thy seed be. And he believed in Jehovah; and he reckoned it to him for righteousness. And he said unto him, I am Jehovah that brought thee out of Ur of the Chaldees, to give thee this land to inherit it.