“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.”
Sunan Ibn Majah Book 36, Hadith 83