Musnad Ahmad 482:155

Yahya ibn Ishaq narrated to us, Ibn Lahi'ah informed us, from Ka'b ibn Alqamah, a freed slave of Uqbah ibn Amir narrated to me, he said: I said to Uqbah ibn Amir: "We have neighbors who drink wine." He said: "Cover them." He said: "I do not want to cover them; I want to go and bring the police upon them." He said: So Uqbah said to him: "Woe to you, hold back regarding them. I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'Whoever sees an imperfection and covers it, he is like one who brought a buried-alive girl back to life from her grave.'"