Concealing faults [except in case of marriage & other occasions when it is crucial to expose truth]

Imam Baqir [a] said: "It is compulsory for every Muslim to conceal even seventy great faults of his fellow Muslims (in order to save his prestige)." (His faults should be dealt with personally but not be spread among the members of society). Bihar-ul-Anwar, vol. 74, p. 301