Sahih Muslim 1844
Sahih Muslim · Book 33: The Book on Government · The obligation of fulfilling oaths of allegiance is owed to the first of two Caliphs
It has been narrated on the authority of 'Abd Rabb al-Ka'ba as-Sa'idl who said:
وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا أَبُو الْمُنْذِرِ، إِسْمَاعِيلُ بْنُ عُمَرَ حَدَّثَنَا يُونُسُ بْنُ، أَبِي إِسْحَاقَ الْهَمْدَانِيُّ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ أَبِي السَّفَرِ ، عَنْ عَامِرٍ ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ، رَبِّ الْكَعْبَةِ الصَّائِدِيِّ قَالَ رَأَيْتُ جَمَاعَةً عِنْدَ الْكَعْبَةِ . فَذَكَرَ نَحْوَ حَدِيثِ الأَعْمَشِ .
I saw a group of people near the Ka'ba.... Then he narrated the tradition as narrated by A'mash.