The Prophet (ﷺ) said, "Whoever swears by a religion other than Islam, is, as he says; 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."
Sahih al-Bukhari Book 83, Hadith 31
← Previous Hadith Allah's Messenger (ﷺ) had a gold ring made for himself, and he used to wear it with the stone towards the inner part of his hand. Consequently, the people had similar rings made for themselves. Afterwards the Prophet; sat on the pulpit and took it off, saying, "I used to wear this ring and keep its stone towards the palm of my hand." He then threw it away and said, "By Allah, I will never wear it." Therefore all the people threw away their rings as well.

Sahih al-Bukhari Book 83, Hadith 30 Next Hadith → Narrated Abu Hurairah that he heard the Prophet (ﷺ) saying, "Allah decided to test three people from Bani Isra'il. So, He sent an angel who came first to the leper and said, '(I am a traveller) who has run short of all means of living, and I have nobody to help me except Allah, and then with your help.'" Abu Hurairah then mentioned the complete narration.

Sahih al-Bukhari Book 83, Hadith 32