The Prophet ﷺ said: It is not allowable for a Muslim to keep apart from his brother for more than three days, for one who does so and dies will enter Hell. (Using translation from Abū Dāʾūd 4914)
قَالَ رَسُولُ اللهِ ﷺ لَا يَحِلُّ لِمُسْلِمٍ أَنْ يَهْجُرَ أَخَاهُ فَوْقَ ثَلاثٍ