Musannaf Ibn Abi Shayba 1:545

545. Ismail bin Ulayyah narrated to us, from Ibn Awn, from Ibn Sirin, who said: I came to Ubaydah, and he ordered a sheep, so it was slaughtered. Then he called for bread, milk, and ghee, and we ate. Then he stood up and prayed, and he did not perform ablution. I thought that it would have been more beloved to him to perform ablution, were it not that he wanted to show me that there was no harm in it.