Sunan Abi Dawud 4914
سنن أبي داود#4914SahihNarrated AbuHurayrah: 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 43:142