Narrated It was narrated from Ibn 'Abbas that 'Umar رضي الله عنه said:
I was with the Prophet (ﷺ) on a campaign, and I swore (an oath), No, by my father! A man called out from behind me: “Do not swear by your fathers.” And I saw that it was the Prophet (ﷺ).
Narrated It was narrated that Sayyar bin al-Ma'roor said:
I heard 'Umar giving a khutbah, and he said: The Messenger of Allah (ﷺ) built this mosque and we, the Muhajireen and Ansar, were with him. If it gets too crowded, then let one of you prostrate on his brother's back. And he saw people (on one occasion) praying in the street and said: Pray in the mosque,