Rabbi Eleazar interpreted the words, "And in you shall the families of the earth be blessed (, "venivrechu")" in to teach that God told Abram that God had two good shoots to graft ("lihavrich") onto Abram's family tree: Ruth the Moabitess (whom reports was the ancestor of David) and Naamah the Ammonitess (whom 1 Kings reports was the mother of Rehoboam and thus the ancestor or good kings like Hezekiah). And Rabbi Eleazar interpreted the words, "All the families of the earth," in to teach that even the other families who live on the earth are blessed only for Israel's sake.