Musannaf Ibn Abi Shayba 17:1098

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Marzuq ibn Bukayr al-Taymi, from ‘Ikrimah, that Ibn ‘Abbas pressed himself against a leper. I said to him, "You press yourself against a leper?" He said, "Let it pass," and he said, "Perhaps he is better than me and better than you."