26:3Ash-Shu'araa

A man fell ill and a cry was raised (for his death). So his neighbour came to the Messenger of Allah (ﷺ) and said to him: He has died. He asked: Who told you? He said: I have seen him. The Messenger of Allah (ﷺ) said: He has not died. He then returned. A cry was again raised (for his death). He came to the Messenger of Allah (ﷺ) and said: He has died. The Prophet (ﷺ) said: He has not died. He then returned. A cry was again raised over him. His wife said: Go to the Messenger of Allah (ﷺ) and inform him. The man said: O Allah, curse him. He said: The man then went and saw that he had killed himself with an arrowhead. So he went to the Prophet (ﷺ) and informed him that he had died. He asked: Who told you? He replied: I myself saw that he had killed himself with arrowheads. He asked: Have you seen him? He replied: Yes. He then said: Then I shall not pray over him.

It was narrated from Jabir bin Samurah that a man from among the Companions of the Prophet (ﷺ) was wounded, and the wound caused him a great deal of pain. He went and took a spearhead, and slaughtered himself with it. The Prophet (ﷺ) did not offer the funeral prayer for him, and that was as an admonition for others.