Riyad as-Salihin, Book 18, Hadith 1591 (In-Book) ⓘ

Anas bin Malik (May Allah be pleased with him) said: The Messenger of Allah said, "Do not desert (stop talking to) one another, do not nurse hatred towards one another, do not be jealous of one another, and become as fellow brothers and slaves of Allah. It is not lawful for a Muslim to stop talking to his brother (Muslim) for more than three days."[Al-Bukhari and Muslim]

وعن أنس رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏ "‏لا تقاطعوا ولا تدابروا، ولا تباغضوا، ولا تحاسدوا، وكونوا عباد الله إخوانًا، ولا يحل لمسلم أن يهجر أخاه فوق ثلاث‏" ‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏