ʿUmar ibn Al-Khaṭṭāb said:
Whoever fulfils the trust [upon him] and holds back from [staining] the honor [and reputation] of Muslims, he is [what a] man [should be].
As quoted by Ibn ʿAbd Al-Barr. Bahjah al-Majālis wa Uns al-Mujālis. Dār Al-Kutub Al-ʿIlmiyyah, vol. 1, p. 397.
N.B.: Title mine (Tr.)
Translated by Mikail ibn Mahboob Ariff