لا تَدابَرُوا، ولا تَقاطَعُوا، وكُونواعِبادَ اللّهِ إخوانا، هَجرُ المُؤمنَينِ ثَلاثا، فإن تَكَلَّما وإلّا أعرَضَ اللّهُ عَزَّوجلَّ عَنهُما حتّى يَتَكلَّما.
The Prophet Muhammad (S):
Do not turn your backs to each other and do not cut ties amongst yourselves, and be servants of Allah as brothers. Deserting a believer [going into a sulk] for [more than] three days [is not allowed] and they must speak [thereafter], but if they do not, Allah Almighty turns away from them until they speak.
Source:
Al-Taghrib w Al-Tarhib
Vol3
P457
ID: 16428