Speak-up When You Should Concerning Allah. Abu Sa’eed al-Khudri reported: The Messenger of Allah, peace and blessings be upon him, said: “Let not one of you belittle himself” They said, “O Messenger of Allah, how can any one of us belittle himself?” The Prophet said: “He finds a matter regarding Allah about which he should speak up but he does not. Allah the Exalted will say to him on the Day of Resurrection: What prevented you from speaking up about such a matter? He will say: It was out of fear of the people. Allah will say: Rather, it is I who deserved to be feared”. Source: Sunan Ibn Majah 4008
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