It was narrated that Ibn `Abbas said:
`Umar (رضي الله عنه) said: I was marching with a group of people on a campaign with the Messenger of Allah (ﷺ), and I swore, saying: No, by my father. A man behind me called out: “Do not swear by your fathers.` I turned around and saw it was the Messenger of Allah (ﷺ).