Ibn Umar heard a man swearing: No, I swear by the Ka'bah. Ibn Umar said to him: I heard the Messenger of Allah (ﷺ) say: He who swears by anyone but Allah is polytheist.
Reference: Sunan Abi Dawud 3251 In-book : Book 22, Hadith 10 English translation : Book 21, Hadith 3245
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