Rabbi Ẓe'era said: These kingdoms were created only as fuel for Gehinnom, as it is said, "Behold, a smoking furnace, and a flaming torch that passed" (Gen. 15:17). Here the word "furnace" signifies only Gehinnom, which is compared to a furnace, as it is said, "Saith the Lord, whose fire is in Zion, and his furnace in Jerusalem" (Isa. 31:9).
THE TRIALS OF ABRAHAM (continued) THE eighth trial (was as follows): "And when Abram was ninety-nine years old" (Gen. 17:1), the Holy One, blessed be He, said to him: Until now thou hast not been perfect before Me; but circumcise the flesh of thy foreskin, and "walk before me, and be thou perfect" (ibid.). Moreover, the foreskin is a reproach, as it is said, "For that is a reproach unto us" (Gen. 34:14), because the foreskin is more unclean than all unclean things, as it is said, "For henceforth there shall no more || come into thee the uncircumcised and the unclean" (Isa. 52:1). For the foreskin is a blemish above all blemishes. Circumcise the flesh of thy foreskin and be perfect.