Musannaf Ibn Abi Shaybah

Ibrahim narrates that once Hazrat Alqama and Hazrat Aswad were going to the mosque with Hazrat Ibn Mas'ud. Meanwhile, a bowl of tharid was brought, so the three of them sat down at one place and ate. Then he asked for water, rinsed his mouth, and wiped the grease of the meat from his hands, then entered the mosque and performed the prayer.