Sufyan ibn Usayd al-Hadrami reported that he heard the Prophet (ﷺ) say, "It is great treachery to tell something to your brother so that he believes you when you are lying to him."
Reference: Al-Adab Al-Mufrad 393 In-book : Book 21, Hadith 9 English translation : Book 21, Hadith 393
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