Gehenna has seven names: Nether-world (or Sheol), Destruction, Pit, Tumultuous Pit, Miry Clay, Shadow of Death and the Underworld. The name Nether -world is mentioned in Psalms 55:16-

“  ישימות (יַשִּׁי מָוֶת), עָלֵימוֹ–יֵרְדוּ שְׁאוֹל חַיִּים:    כִּי-רָעוֹת בִּמְגוּרָם בְּקִרְבָּם.”

“May He incite death against them, let them go down alive into the nether-world; for evil is in their dwelling, and within them.” 

The name pit is mentioned in The Book of Ezekiel 26:20-

” וְהוֹרַדְתִּיךְ אֶת-יוֹרְדֵי בוֹר אֶל-עַם עוֹלָם, וְהוֹשַׁבְתִּיךְ בְּאֶרֶץ תַּחְתִּיּוֹת כָּחֳרָבוֹת מֵעוֹלָם אֶת-יוֹרְדֵי בוֹר.”

” then will I bring thee down with them that descend into the pit, to the people of old time, and will make thee to dwell in the nether parts of the earth, like the places that are desolate of old, with them that go down to the pit, that thou be not inhabited;”

The name shadow of death appears in Psalms 107:10-

” יֹשְׁבֵי, חֹשֶׁךְ וְצַלְמָוֶת;   אֲסִירֵי עֳנִי וּבַרְזֶל”

“Such as sat in darkness and in the shadow of death, being bound in affliction and iron”

In the Kabbalah, Gehenna is called a “waiting room” for all souls and not just the souls of the sinners.

According to rabbinic literature, people don’t stay in Gehenna forever. Gehena is a place or state where the wicked are temporarily punished after death.
Rabbi Akiva claims that the longest that one can be there is 12 months.

In legendry stories, the sinners must pass “the seven stages of hell” (shiv’a medorei geihinom). In each gate, the sinners are suffering a different punishment.

 Main phrases of the post + transcription + translation

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