OBEY TO THE UTMOST OF YOUR ABILITY H 669 "When we took our oath of allegiance with the Prophet, praise and peace be upon him, to hear and obey, he would add: 'As much as you can.'" R 669 Bukhari and Muslim with a chain up to ibn Omar who related this hadith.
663- وعنه ، قَالَ : كُنَّا إِذَا بَايَعْنَا رسولَ الله صلى الله عليه وآله وسلم عَلَى السَّمعِ والطَّاعَةِ ، يَقُولُ لَنَا : "فِيمَا اسْتَطَعْتُمْ" متفقٌ عَلَيْهِ .