Sunan Ibn Majah Book 36, Hadith 4008

حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ، وَأَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ أَبِي الْبَخْتَرِيِّ، عَنْ أَبِي سَعِيدٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ لاَ يَحْقِرْ أَحَدُكُمْ نَفْسَهُ ‏"‏ ‏.‏ قَالُوا يَا رَسُولَ اللَّهِ كَيْفَ يَحْقِرُ أَحَدُنَا نَفْسَهُ قَالَ ‏"‏ يَرَى أَمْرًا لِلَّهِ عَلَيْهِ فِيهِ مَقَالٌ ثُمَّ لاَ يَقُولُ فِيهِ فَيَقُولُ اللَّهُ عَزَّ وَجَلَّ لَهُ يَوْمَ الْقِيَامَةِ مَا مَنَعَكَ أَنْ تَقُولَ فِي كَذَا وَكَذَا فَيَقُولُ خَشْيَةُ النَّاسِ ‏.‏ فَيَقُولُ فَإِيَّاىَ كُنْتَ أَحَقَّ أَنْ تَخْشَى ‏"‏ ‏.‏

It was narrated from Abu Sa’eed that the Messenger of Allah (ﷺ) said:“No one of you should belittle himself.” They said: “O Messenger of Allah, how could anyone of us belittle himself?” He said: “If he sees something concerning which he should speak out for the sake of Allah but does not say anything. Allah will say to him on the Day of Resurrection: “What prevented you from speaking concerning such and such?” He will say: “Fear of the people.” (Allah) will say: “Rather you should have feared Me.”