Genesis 15:4-6
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4Then behold, the word of the Lord came to him, saying, “This man will not be your heir; but one who will come from your own body shall be your heir.” 5And He took him outside and said, “Now look toward the heavens and count the stars, if you are able to count them.” And He said to him, “So shall your descendants be.” 6Then he believed in the Lord; and He credited it to him as righteousness.