Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said: I am Abu Hammad. I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever finds a Muslim in a state of fault and conceals it, it is as though he brought back to life a baby girl buried alive from her grave."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14935