Musnad Ahmad 25:1380

Yahya narrated to us, from Ibn Jurayj, from ‘Ata’, from Ibn ‘Abbas, that he invited his brother, ‘Ubayd Allah, to food on the day of ‘Arafah. He said: "I am fasting." He said: "You are leaders who are followed. I have seen the Messenger of Allah (ﷺ) call for a milking vessel on this day, and he drank." And Yahya said once: "A household that is followed."