Sahih al-Bukhari 2714
Sahih al-Bukhari · Book 54: Conditions · The conditions permissible on embracing Islam, and in contracts and transactions
Narrated Jarir:
حَدَّثَنَا أَبُو نُعَيْمٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ زِيَادِ بْنِ عِلاَقَةَ ، قَالَ سَمِعْتُ جَرِيرًا ـ رضى الله عنه ـ يَقُولُ بَايَعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَاشْتَرَطَ عَلَىَّ وَالنُّصْحِ لِكُلِّ مُسْلِمٍ.
When I gave the pledge of allegiance to Allah's Messenger (ﷺ) and he stipulated that I should give good advice to every Muslim.