Abu Huraira reported that Allah's Messenger (ﷺ) said
Verily Allah created the universe and when He had finished that, ties of relationship came forward and said This is the place for him who seeks refuge from severing (of blood-relationship). He said: Yes. Are you not satisfied that I should keep relationship with one who joins your ties of relationship and sever it with one who severs your (ties of relationship)? They (the ties of blood) said: Certainly so. Thereupon He said: Well, that is how things are for you. Allah's Messenger (ﷺ) then said: Recite if you like:" But if you turn away you are sure to make mischief in the land and cut off the ties of kinship. Those it is whom Allah has cursed, so He has made them deaf and blinded their eyes. Do they not reflect on the Qur'an? Or, are there locks on their hearts?".
'A'isha reported Allah's Messenger (ﷺ) as saying
The tie of kinship is suspended to the Throne and says: He who unites me Allah would unite him and he who severed me Allah would sever him.
Jubair 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.
Jubair b. Mutlim reported that his father narrated to him that Allah's Messenger (ﷺ) said
The severer of the tie of kinship would not get into Paradise.
This hadith has been narrated on the authority of Zuhri with the same chain of transmitters.
Anas b. Malik reported
I heard Allah's Messenger (ﷺ) as saying: He who is desirous that his means of sustenance should be expanded for him or his age may be lengthened, should join the tie of relationship.
Anas b. Malik reported that Allah's Messenger (ﷺ) said
He who likes that his sustenance should be expanded and his age may be lengthened should join the tie of kinship.
Abu Huraira reported that a person said
Allah's Messenger, I have relatives with whom I try, to have close relationship, but they sever (this relation). I treat them well, but they treat me ill. I am sweet to them but they are harsh towards me. Upon this he (the Holy Prophet) said: If it is so as you say, then you in fact throw hot ashes (upon their faces) and there would always remain with you on behalf of Allah (an Angel to support you) who would keep you dominant over them so long as you adhere to this (path of righteousness).