Muwatta Malik 1024
موطأ مالك#1024SahihYahya related to me from Malik from Nafi from Abdullah ibn Umar that one time the Messenger of Allah, may Allah bless him and grant him peace, was speaking to Umar ibn al-Khattab while he was travelling with a troop and Umar swore by his father and he (the Messenger) said, "Allah forbids you to swear by your fathers. If anyone swears, let him swear by Allah or keep silent
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih
In-book reference: 22:11