Mukhtasar Bukhari

Narrated by Sayyiduna Jundub (may Allah be pleased with him) from the Noble Prophet (peace and blessings of Allah be upon him) that he said: "A man received some wounds, so he killed himself. Allah the Exalted said: 'My servant has hastened before Me (i.e., he took his own life), therefore I have made Paradise forbidden for him.'"