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: 6366
This hadith has been reported by Zuhri on the authority of Malik, and in the hadith transmitted on the authority of Sufyan (the words are):" He would enter into Fire, except for the fulfilment of the oath."