Narrated Ibn 'Umar: 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
SahihSahihSahih Bukhari (6108) Sahih Muslim (1646)Book 22 · Hadith 8