The Messenger of Allah (ﷺ) found 'Umar al-Khattab in a caravan while he was swearing by his father. So he said: Allah forbids you to swear by forefathers. If anyone swears, he must swear by Allah or keep silence.
Reference: Sunan Abi Dawud 3249 In-book : Book 22, Hadith 8 English translation : Book 21, Hadith 3243
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