God's Footstool

Rabbi Yochanan ben Zakkai opened: "On that day the LORD made a covenant with Abram, saying" (Genesis 15:18). Abraham said before the Holy One, blessed be He: Master of all worlds, behold, You have not given me offspring, and yet You say to me, "To your offspring I have given this land" (Genesis 15:18)? "How shall I know that I will inherit it?" (Genesis 15:8). The Holy One, blessed be He, said to him: Abraham, the entire world stands upon My word, and you do not believe in My word? Yet you say, "How shall I know that I will inherit it?" By your life, twice shall you surely know, as it is said, "And He said to Abram, you shall surely know" (Genesis 15:13).