Abu Bakr As-Siddiq said: “O you people! You recite this Ayah: Take care of yourselves! If you follow the guidance no harm shall come to you. I indeed heard the Messenger of Allah (peace be upon him) saying: ‘When the people see the wrongdoer and they do not take him by the hand, then soon Allah shall envelope you in a punishment from him.’”
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Jami`at-Tirmidhi, Vol. 4, Book 33, Hadith 11