حَدَّثَنَا عِمْرَانُ بْنُ مُوسَى، أَنْبَأَنَا حَمَّادُ بْنُ زَيْدٍ، حَدَّثَنَا عَلِيُّ بْنُ زَيْدِ بْنِ جُدْعَانَ، عَنْ أَبِي نَضْرَةَ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَامَ خَطِيبًا فَكَانَ فِيمَا قَالَ ‏"‏ أَلاَ لاَ يَمْنَعَنَّ رَجُلاً هَيْبَةُ النَّاسِ أَنْ يَقُولَ بِحَقٍّ إِذَا عَلِمَهُ ‏"‏ ‏.‏ قَالَ فَبَكَى أَبُو سَعِيدٍ وَقَالَ قَدْ وَاللَّهِ رَأَيْنَا أَشْيَاءَ فَهِبْنَا ‏.‏

It was narrated from Abu Sa’eed Al-Khudri that the Messenger ofAllah (PBUH) stood up to deliver a sermon, and one of the things hesaid was: “Indeed, fear of people should not prevent a man from speakingthe truth, if he knows it.”Then Abu Sa'eed wept and said: "By Allah, we have seen things that made us scared (and we did not speak up)." Translation Not Available

Book Ref: Sunan Ibn Majah Book 36 Hadith 4007
Web Ref:  Sunan Ibn Majah Vol 5 Book 36 Hadith 4007