Sahih Bukhari Volume 9, Book 93, Hadith 7202

‏"‏وَأَنْ لاَ نُنَازِعَ الأَمْرَ أَهْلَهُ، وَأَنْ نَقُومَ ـ أَوْ نَقُولَ ـ بِالْحَقِّ حَيْثُمَا كُنَّا لاَ نَخَافُ فِي اللَّهِ لَوْمَةَ لاَئِمٍ ‏"‏‏.‏

and would stand firm for the truth or say the truth wherever we might be, and in the Way of Allah we would not be afraid of the blame of the blamers.