Musnad Ahmad 9618 — Musnad of Abu Hurayrah (may Allah be pleased with)

It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever kills himself with a sharp instrument (commits suicide), that sharp instrument will be in his hand with which he will continue to stab his belly in the Hellfire, and he will remain there forever and ever. Whoever kills himself by throwing himself down (from a height), he will continue to throw himself down in the Hellfire. And whoever strangles himself to death, he will continue to strangle himself in the Hellfire.