"Whoever protects his brother's honor, Allah protects his face from the Fire on the Day of Resurrection."
Jami` at-Tirmidhi Book 27, Hadith 37
← Previous Hadith : "Whoever relieves a Muslim of a burden from the burdens of the world, Allah will relieve him of a burden from the burdens on the Day of Judgement. And whoever helps ease a difficulty in the world, Allah will grant him ease from a difficulty in the world and in the Hereafter. And whoever covers (the faults of) a Muslim, Allah will cover (his faults) for him in the world and the Hereafter. And Allah is engaged in helping the worshipper as long as the worshipper is engaged in helping his brother."

Jami` at-Tirmidhi Book 27, Hadith 36 Next Hadith → : It is not lawful for the Muslim to shun his brother for more than three (days); they come fare to fare and this one turns away, and that one turns away. The best of them is the one who initiates the Salam."

Jami` at-Tirmidhi Book 27, Hadith 38