Sunan an-Nasa'i 4153
It was narrated that 'Ubadah bin As-Samit said:
"We pledged to the Messenger of Allah to hear and obey during our hardship and our ease, when we felt energetic and when we felt tired, that we would not contend with the orders of  whomever was entrusted with it, that we would stand for justice wherever we may be, and that we would not fear the blame of any blamer for the sake of Allah.
أَخْبَرَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا أَبُو أُسَامَةَ، قَالَ حَدَّثَنِي الْوَلِيدُ بْنُ كَثِيرٍ، قَالَ حَدَّثَنِي عُبَادَةُ بْنُ الْوَلِيدِ، أَنَّ أَبَاهُ الْوَلِيدَ، حَدَّثَهُ عَنْ جَدِّهِ، عُبَادَةَ بْنِ الصَّامِتِ قَالَ بَايَعْنَا رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى السَّمْعِ وَالطَّاعَةِ فِي عُسْرِنَا وَيُسْرِنَا وَمَنْشَطِنَا وَمَكَارِهِنَا وَعَلَى أَنْ لاَ نُنَازِعَ الأَمْرَ أَهْلَهُ وَعَلَى أَنْ نَقُولَ بِالْعَدْلِ أَيْنَ كُنَّا لاَ نَخَافُ فِي اللَّهِ لَوْمَةَ لاَئِمٍ ‏.‏