Genesis 15:3-5

3And Abram said, “Behold, you have given me no offspring, and aa member of my household will be my heir.” 4And behold, the word of the Lord came to him: “This man shall not be your heir; byour very own son
Hebrew what will come out of your own loins
shall be your heir.”
5And he brought him outside and said, “Look toward heaven, and dnumber the stars, if you are able to number them.” Then he said to him, eSo shall your offspring be.”
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