General Behavior (Kitab Al-Adab)
Dawud :: Book 41 : Hadith 4872
Narrated Abdullah ibn Mas'ud:
Zayd ibn Wahb said: A man was brought to Ibn Mas'ud. He was told: This is so and so, and wine was dropping from his beard. Abdullah thereupon said: We have been prohibited to seek out (faults). If anything becomes manifest to us, we shall seize it.