Midrasz do Hioba 42:16

... 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)

And her name was Keturah: Rav said, "She is Hagar." Rabbi Nechemiah said to him, "And is it not written, 'he added.'" He said to him, "[That signifies that] he [now] married her according to the [Divine] word; like that which you say (Isaiah 8), 'And the Lord added to speak to me more.'" He said to him, "And is it not written, 'And her name was Keturah?'" He said to him, "[It is] since she was fragrant (mekuteret) with commandments and good deeds." He said to him, "And is it not written, 'And to the sons of the concubines that Avraham had?'" He said, "It is [actually] written, 'concubine' (in the singular, such that there only be one concubine - Hagar)." "While he was still alive (chai)" - [this is a reference to] the one that sat by the well and said to the Life (chai) of the worlds, "Look at my embarrassment!" Rabbi Berakhia said, "Even though you say (Genesis 21:14), 'and she went and strayed in the wilderness, etc., [such that] you would say that she was suspected with any [other man]; hence we learn to say, 'And her name was Keturah' - like a type of knot (ketur) like this, [with which] he seals a storehouse and opens it with a seal, [that is] tied and sealed." Bar Kapra said, "The addition of the Holy One, blessed be He, is greater than the main part: Kayin was was the main part and as a result of Hevel being the addition - as it is is written (Genesis 4:2), 'And she added to give birth' - he and his two twins were born; Yosef was the main part, and as a result of it being written, addition, with Binyamin, he established ten [children], as it is written (Genesis 46:21), ' And the children of Binyamin were Bela and Becher, etc.'; Er was the main part, and as a result of Shelah being [born] with the language of addition, he established ten [courts], behold, it is written in I Chronicles 4:21, 'And the sons of Shelah the son of Yehudah were Er, the father (a term that is also used for the head of a court) of Lecha, and Ladah, the father of Maresha, and the families of the house Avodat HaButs of the house of Ashbea'; the main part of the years of Iyov were only seventy years, [and] one hundred and forty years were added to him, as it is written (Job 42:16), 'And Iyov lived after this one hundred and forty years'; the main part of the reign of Chizkiyahu was only fourteen years, and fifteen years were added to him, as it states (Isaiah 38:), 'behold, I will add fifteen years to your days; Yishmael is the main part, and as a result of the children of Keturah being [born] with the language of addition, 'And she gave birth for him to Zimran, etc.'"