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.  

أَنَّهُ سَمِعَ عَبْدَ اللَّهِ بْنَ عُمَرَ يَقُولُ كُنَّا نُبَايِعُ رَسُولَ اللَّهِ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ يَقُولُ لَنَا فِيمَا اسْتَطَعْتَ  

We used to take the oath of allegiance to the Prophet ﷺ to hear and obey, and he would tell: In What I am able. (Using translation from Abū Dāʾūd 2940)   

بَايَعْتُ النَّبِيَّ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ فِيمَا اسْتَطَعْتُ  

“I heard Anas bin Malik say: ‘We gave our pledge to the Messenger of Allah ﷺ on the basis that we would listen and obey. He ﷺ said: “As much as you can.” (Using translation from Ibn Mājah 2868)   

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ يَقُولُ بَايَعْتُ رَسُولَ اللهِ ﷺ بِيَدِي هَذِهِ يَعْنِي الْيُمْنَى عَلَى السَّمْعِ وَالطَّاعَةِ فِيمَا اسْتَطَعْتُ  

“I heard Anas bin Malik say: ‘We gave our pledge to the Messenger of Allah ﷺ on the basis that we would listen and obey. He ﷺ said: “As much as you can.” (Using translation from Ibn Mājah 2868)   

بَايَعْنَا رَسُولَ اللهِ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ فَقَالَ فِيمَا اسْتَطَعْتُمْ  

We used to take the oath of allegiance to the Prophet ﷺ to hear and obey, and he would tell: In What I am able. (Using translation from Abū Dāʾūd 2940)   

بَايَعْتُ النَّبِيَّ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ فَلَقَّنَنِي فِيمَا اسْتَطَعْتُ  

"عَنْ أنسٍ قَالَ: بَايَعْتُ رَسُولَ الله ﷺ بِيَدِى هَذِهِ عَلَى السَّمْع وَالطَّاعَةِ فِيمَا اسْتَطَعْتُ".  

"عَنِ ابْنِ عُمَرَ قَالَ: كُنَّا نُبَايِعُ رَسُولَ الله ﷺ عَلَى السَّمعْ وَالطَّاعَةِ، فَيَقُولُ لَنَا: فِيمَا اسْتَطَعْتُمْ".