Volume 8, Book 73, Number 126:
Narrated Thabit bin Ad-Dahhak:
Volume 8 – 1358 / 1700
SAHIH BUKHARI VOLUME 8 > BOOK 73: GOOD MANNERS AND FORM (AL-ADAB)
The Prophet said, “Whoever swears by a religion other than Islam (i.e. if he swears by saying that
he is a non-Muslim in case he is telling a lie), then he is as he says if his oath is false and whoever
commits suicide with something, will be punished with the same thing in the (Hell) fire, and cursing
a believer is like murdering him, and whoever accuses a believer of disbelief, then it is as if he had
killed him.”