138
Musnad AhmedIt 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).
Reference: Musnad Ahmad 291
Arabic/English book : Book 2, Hadith 291
Arabic/English book : Book 2, Hadith 291