Jami` at-Tirmidhi 1935
جامع الترمذي#1935SahihAnas narrated that the Messenger of Allah said:"Do not cut off one another, nor desert one another, nor hate one another, nor envy one another. Be you , O worshippers o Allah, brothers. It is not lawful for the Muslim to shun his brother for more than three(days)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 27:41