His brothers told their father that a wild beast had killed Joseph. Jacob grieved and refused to be comforted, saying, “I shall go down to Sheol to my son, mourning.

Sheol is the “grave”, “pit”, or “abyss” in Hebrew. Sheol is the earliest conception of the afterlife in the Jewish scriptures. It is a place of darkness to which all dead go, regardless of the moral choices made in life. Sheol is a concept that predates the Christian and Muslim ideas of judgment after death and also predates, and is different from, Heaven and Hell. It is unclear whether Sheol was to be considered a real place or a way of describing the unknown status of a person’s conscious being.
-Strong’s Hebrew and Greek Dictionaries/Strong’s Concordance-