Midrasch zu Schemot 1:6

"And Yosef and his brothers and their entire generation passed away," to teach you that as long as one of them was still alive from the original ones that came down to Egypt, the Egyptians did not enslave the Israelites. "And the children of Israel reproduced and spawned," even though Yosef and his brothers died, their God did not die, instead "the children of Israel reproduced and spawned." Another point: Each one gave birth to six children in one litter, as it says: "And the children of Israel reproduced and spawned ..." Some say: Twelve [children in each litter] as it is written: "reproduced" - two, "spawned" - two, "they were many" - two, "they were massive" - two, "very much" - two, "and the land was filled with them" - two, for a total of twelve. "They were massive," some say: six children in each litter. And don't be incredulous, since the scorpion is one of the crawling creatures, and it gives birth to seventy at a time. Rabbi Natan says, "And the land was filled with them," like a field of reeds. "A new king arose," since the Egyptians saw this, they enacted new decrees upon them. That which is written: "A new king arose," Rav and Shmuel [interpret it]. One says: literally new. The other says: his decrees were new, he established decrees and punishments on them. The rationale of the one that says it was literally a new king, as it is written: "new." The rationale of the one that says it is referring to new decrees, since it is not written: "and he died, and a king was anointed." "Who did not know Yosef" -- according to the one who said it was a new king, this makes sense. According to the one who said he established new decrees, how does he explain ["that did not know Yosef"]? That he was _like_ one who did not know Yosef at all. The Rabbis say: Why does it call him a "new king"? Wasn't this the same Pharaoh as before? But the Egyptians said to Pharaoh: "let us mix it up with this nation." He said to them: "You are crazy! Until now we have eaten only because of them; how can we mix it up with them?! Were it not for Yosef we would all be dead." When he didn't listen to them, they deposed him from the throne for three months, until he said to them: "Whatever you want to do I am with you," and they re-appointed him. That is why it says, "A new king arose." The Rabbis took their opening text from this verse (Hosea 5:7): "Against God they have rebelled since they have given birth to foreign children, now the new moon will consume their parts." To teach you that when Yosef died they stopped performing circumcision; they said: Let us be like the Egyptians. From this you learn that Moshe circumcised them on their leaving Egypt. And when they did this [stopped observing circumcision], God converted the love of the Egyptians for them into hatred, as it says (Psalms 105:25): "He changed their mind to hate his nation, to harass his servants", to fulfill the verse (Hosea 5:7): "Now the new moon will consume their parts" [translator's note: the word "new moon," "hodesh," is re-vocalized by the Midrash to the word "new," "hadash."]. "A new king," since he arose and enacted new decrees against them. "Who did not know Yosef," and did he really not know Yosef?! Rabbi Abin said: It is like a parable of one who stoned to death the king's friend. The king said, Cut off his head, for tomorrow he will do the same thing to me. therefore Scripture says of him [Pharaoh] - in other words: today, "he did know Yosef," tomorrow, he will say (Exod. 5:2): "I do not know Adonai."

And after the death of Joseph all the Egyptians began to rule over the children of Israel in ‎those days, and Pharaoh, the king of Egypt, who was reigning instead of his father, took upon ‎himself all the laws and government affairs of Egypt, and everything was under his control, and ‎he ruled securely over his people. And at the revolution of the year which was the seventy ‎second year of the children of Israel’s going down to Egypt, after the death of Joseph, Zepho ‎the son of Eliphaz son of Esau escaped from Egypt with his men, and they came to Danhabah, ‎to Augias, king of Africah, and Augias received them with great honors, and he made Zepho ‎the chief of his hosts. And Zepho found favor in the eyes of Augias and in the eyes of all his ‎people, and Zepho was chief of hosts unto Augias, king of Africah, for many days. And Zepho ‎enticed Augias, king of Africah, to assemble all his armies, and to go to war with the Egyptians ‎and with the sons of Jacob, and to avenge on them the cause of his brothers. But Augias was ‎not willing to listen unto Zepho to do this thing, for Augias knew the strength of the sons of ‎Jacob, and what they had done unto his armies in their war with the children of Esau. And in ‎those days Zepho was very great in the eyes of Augias and in the eyes of all his people, and he ‎always enticed Augias to fight with Egypt, but he would not. ‎

... The judgment of the wicked in Gehinnom lasts twelve months, as it says “And it shall be from new moon to new moon…” (Yeshayahu 66:23) R’ Yochanan ben Nuri says: from Pesach until Atzeret (Shavuot), as it says “…and from Sabbath to Sabbath…” (ibid.) After twelve months the souls of the sinners of Israel who transgressed the Torah and the commandments are consumed and their bodies are consumed and they are turned to dust. Gehinnom spits them out and the wind scatters them underneath the feet of the righteous, as it says “And you shall crush the wicked, for they will be as ash under the soles of your feet…” (Malachi 3:21) But those who separated from the ways of the community, like the Sadducees, and the betrayers and the hypocrites and the heretics, and those who ‘spread their terror in the land of the living,’ and those who denied the resurrection, and those who say Torah is not from heaven, and those who scoff at the words of the Sages – Gehinnom is locked before them and they are judged there forever, as it says “And they shall go out and see the corpses of the people who rebelled against Me…” (Yeshayahu 66:24) Not only this, but the netherworld will cease to be but they will not cease to be, as it says “…and their form will outlast the grave as his dwelling place (zevul).” (Tehillim 49:15) From His dwelling place He will wear out their form, and their form will wear out the netherworld. What caused this to happen to them? Because they stretched out their hands against the dwelling place, as it says ‘as his dwelling place,’ and there is no dwelling place other than the Holy Temple, as it says “I have surely built You a house to dwell in…” (Melachim I 8:13)