The Book on Government
33/22. Chapter:
Oath of allegiance pledging to hear and obey as much as possible
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ، وَابْنُ، حُجْرٍ - وَاللَّفْظُ لاِبْنِ أَيُّوبَ - قَالُوا حَدَّثَنَا إِسْمَاعِيلُ، - وَهُوَ ابْنُ جَعْفَرٍ - أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ دِينَارٍ، أَنَّهُ سَمِعَ عَبْدَ اللَّهِ بْنَ عُمَرَ، يَقُولُ كُنَّا نُبَايِعُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى السَّمْعِ وَالطَّاعَةِ يَقُولُ لَنَا " فِيمَا اسْتَطَعْتَ " .
It has been narrated on the authority of Abdullah b. 'Umar who said: We used to take oath to the Messenger of Allah (ﷺ) that we would listen to and obey his orders. He would tell us (to say in the oath): As far as it lies in my power.
Reference : Sahih Muslim 1867In-book reference : Book 33, Hadith 132USC-MSA web (English) reference : Book 20, Hadith 4604