Musannaf Ibn Abi Shayba 27:477

Mu'awiyah ibn Hisham narrated to us, he said: 'Ammar narrated to us, from al-A'mash, from al-Minhal, from 'Abdullah ibn al-Harith, from 'Ali, who said: "The likeness of us in this nation is only like the Ark of Nuh (Noah) and the Gate of Repentance (Hittah) among the Children of Israel."