Riyad as-SalihinChapter 17Hadith 888
Full Sharh — Riyad as-Salihin 888
وعن أنس رضي الله عنه أن النبي صلى الله عليه وسلم قال: "لا تباغضوا، ولا تحاسدوا ولا تدابروا، ولا تقاطعوا، وكونوا عباد الله إخوانًا، ولا يحل لمسلم أن يهجر أخاه فوق ثلاث" ((متفق عليه)).
English Translation
Anas bin Malik (May Allah be pleased with him) said:: The Prophet (ﷺ) said, "Do not harbour grudge against one another, nor jealousy, nor enmity; and do not show your backs to one another; and become as fellow brothers and slaves of Allah. It is not lawful for a Muslim to avoid speaking with his brother beyond three days.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of the Prohibited actions
Hadith Number
888