Oath of allegiance pledging to hear and obey as much as possible Sahih Muslim 1867
Arabic hadith text
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 كُنَّانُبَايِعُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى السَّمْعِ وَالطَّاعَةِ يَقُولُ لَنَا " فِيمَا اسْتَطَعْتَ "
Translation
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.