Yalkut.
In T.B. P'sachim, fol. 54, col. 1, it is said that the reason of the omission of the words, "And God saw that it was good," in respect to the second day of the creative week, was because hell-fire was then created; but see the context.
When Adam saw (through the Spirit) that his posterity would be condemned to Gehenna, he disobeyed the precept to procreate. But when he perceived that after twenty-six generations the Israelites would accept the law, he bestirred himself in compliance; as it is said (Gen. iv. 1), Adam vero cognovit uxorem suam Hevam.
Yalkut.
"And the souls they had gotten in Haran" (Gen. xii. 5). These are they who had been made proselytes. Whoever attracts a Gentile and proselytizes him is as much as if he had created him. Abraham did so to men and Sarah to women.
Bereshith Midrash Rabbah.
"Sing and rejoice" (Zech. ii. 10). The Holy One—blessed be He!—will in the future bring all the proselytes that were proselytized in this world, and judge all the nations of the world in their presence. He will say to them, "Why have ye left Me and served idols, which are nothing?" They will reply and say, "Had we applied at Thy door, Thou wouldst not have received us." Then will He say to them, "Let the proselytes that were made from among you come forward and testify against you."
P'sikta.
These are the pious female proselytes—Hagar, Osenath, Zipporah, Shiphrah, Puah, the daughter of Pharaoh (Bathia), Rahab, Ruth, and Jael.
Yalkut Yehoshua, 9.