Better to receive punishment in this world, rather than after death: Pesachim 57b
Those who remain in Hell past 12 months: Rosh HaShanah 17a
Isaac's merit keeping the Jews from Hell: Shabbat 104a
Why Gehennom has the name "Gehennom": Eruvin 19a
Gehennom is also titled "Yam Kol [Sea of All]" because so many go there: R. Shabbat 104a "LiYam Kol"
Gehennom is also known as "Tifteh": Eruvin 19a
Gehennom is also known as "Sheol": Eruvin 19a
Gehennom is also known as "Avadon": Eruvin 19a
Gehennom is also known as "Be'er Shachat": Eruvin 19a
Gehennom is also known as "Bor Shaon": Eruvin 19a
Gehennom is also known as "Tit haYavan": Eruvin 19a
Gehennom is also known as "Tzalmavet": Eruvin 19a
Gehennom is also known as "Eretz haTachtit": Eruvin 19a
Gehennom is also known as "Paku": Megillah 15b
Gehennom is also known as "Raah [Evil]": Nedarim 22a, 40a
Rage causes one to be afflicted by "types of Hell": Nedarim 22a
When Avshalom was hanging, he saw Gehennom open beneath him: Sotah 10b
King David cried out over Avshalom, "My son," eight times; this brought Avshalom out of seven levels of Gehennom, and either caused his head to come back to his body, or brought him into the next world: Sotah 10b
When humans punish a wicked person, they have to shut the wicked person's mouth to keep him from slandering them; Gd punishes the wicked in Gehennom, and they admit His justice: Eruvin 19a
Whether the wicked repent at the entrance to Gehennom, or not: Eruvin 19a
The punishment of those who cause others to sin carelessly, with their bodies: Rosh HaShanah 17a [2x]
The Definition of the Above category includes Jews who don't wear Phylacteries: Rosh HaShanah 17a
The Definition of the Above category includes non-Jews who reign with terror, or who cause sexual sin: Rosh HaShanah 17a
Korach's children were saved from descending into Hell: Megillah 14a
When Nevuchadnezzar descended to Hell, the people there thought he had come to rule them, until a Bat Kol [Divine Voice] put him in his place: Shabbat 149b-150a
Avraham saves his descendants from Gehennom, unless they intermarried: Eruvin 19a
Attributes/Acts which prevent entry to Hell
Jews are protected from the fires of Gehennom by their Mitzvot: Eruvin 19a
