Sahih Muslim 6520
صحيح مسلم#6520SahihJubair b. Mut'im reported on the authority of his father that Allah's Messenger (ﷺ) said:The severer would not enter Paradise. Ibn Umar said that Sufyan (explained it as): One who severs the tie of kinship would not enter Paradise
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 45:20