Sahih Muslim
The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wal-Adab)
Book Number: 032 / Hadith Number: 6199
'A'isha reported Allah's Messenger (may peace be upon him) 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.