Masruq narrates: Ibn Mas'ud (may Allah be pleased with him) came out to the people of the house and said to them: "Whoever of you has come seeking a legal ruling (fatwa), let him sit until we give him the ruling; whoever of you has come with a dispute, let him stay with his opponent until we judge between them; and whoever of you has come to inform us of a fault which Allah has concealed, let him cover himself with Allah's covering and keep it hidden with the One who has the power to forgive it, for we do not have the power to forgive it, and we would establish the prescribed punishment (hadd) upon him in full detail."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8874