Highest Faith and Least Faith: Eradicating and Stopping evil, oppression and cruelty in the society

Book 001, Number 0079:Saheeh Muslim

It is narrated on the authority of Tariq b. Shihab: It was Marwan who initiated (the practice) of delivering khutbah (address) before the prayer on the 'Id day. A man stood up and said: Prayer should precede khutbah. He (Marwan) remarked, This (practice) has been done away with. Upon this Abu Sa'id remarked: This man has performed (his duty) laid on him. I heard the Messenger of Allah as saying: He who amongst you sees something wrong should stop it with the help of his hand; and if he has not strength enough to do it, then he should do it with his tongue, and if he has not strength enough to do it, (even) then he should (abhor it) from his heart, and that is the least of faith.

The Importance of Good words, Silence, Treating neighbour with kindness and Hospitality to Guest : Sign of Faith (Iman)

Book 001, Number 0075: Saheeh Muslim

It is reported on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) observed: He who believes in Allah and the Last Day should either utter good words or better keep silence; and he who believes in Allah and the Last Day should treat his neighbour with kindness and he who believes in Allah and the Last Day should show hospitality to his guest.