The Book of al-Bay'ah
39/6. Chapter:
Pledging To Be Sincere Toward Every Muslim
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ يَزِيدَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ زِيَادِ بْنِ عِلاَقَةَ، عَنْ جَرِيرٍ، قَالَ بَايَعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى النُّصْحِ لِكُلِّ مُسْلِمٍ .
It was narrated that Jarir said: "I pledged to the Messenger of Allah to be sincere toward ever Muslim."
Reference : Sunan an-Nasa'i 4156In-book reference : Book 39, Hadith 8English translation : Vol. 5, Book 39, Hadith 4161