Chapter: Clarifying the condition of faith for one who says to his muslim brother: O Kafir (Disbeliever).

Hadith 60 Part A

setting

It is reported on the authority of Ibn 'Umar that the Apostle (may peace and blessings be upon him) observed

When a man calls his brother an unbeliever, it returns (at least) to one of them.

Hadith 60 Part B

setting

It is reported on the authority of Ibn 'Umar that the Messenger of Allah (may peace and blessings be upon him) said

Any person who called his brother: "O unbeliever" (has in fact done an act by which this unbelief) would return to one of them. If it were so, as he asserted (then the unbelief of man was confirmed but if it was not true), then it returned to him (to the man who labeled it on his brother Muslim).