THE EGYPTIAN BONDAGE RABBAN JOCHANAN, son of Ẓakkai, opened (his exposition with the text): "In that day the Lord made a covenant with Abram, saying, Unto thy seed will I give this land, from the river of Egypt unto the great river, the river Euphrates" (Gen. 15:18). Abram said before the Holy One, blessed be He, Sovereign of all the universe! Thou hast not given me seed, yet dost Thou say, "Unto thy seed will I give || this land" (ibid.).
He said: "Whereby shall I know that I shall inherit it?" (Gen. 15:8). The Holy One, blessed be He, said to him: Abram! The entire world stands by My word, and thou dost not believe in My word, but thou sayest, "Whereby shall I know that I shall inherit it?" (ibid.). By thy life!
In two ways shalt thou surely know, as it is said, "And he said to Abram, Know of a surety that thy seed shall be a stranger in a land which is not theirs,… and they shall afflict them" (Gen. 15:18).