Jewish belief in seven layers of hell?

Jews do not believe in eternal Hell. The closest concept in Judaism is Geh-Hinom, which is a desert valley where pagan human sacrifices were once performed. Later it became used as a garbage dump.

Answer:The above is mistaken. Jews do indeed believe in reward and punishment after death; and it is listed as one of the most fundamental of Jewish beliefs (Rambam, introduction to Shemonah Perakim). In some cases, the punishment is eternal (Talmud, Nedarim 8; Rosh Hashanah 17a).

The Talmud borrows the Word "gehinnom" to refer to the punishment of wicked souls, but the tradition itself predates the use of that particular Word.