سُفْيَانُ بْنُ أَسَدٍ الْحَضْرَمِيُّ
I heard the Messenger of Allah ﷺ say: It is great treachery that you should tell your brother something and have him believe you when you are lying. (Using translation from Abū Dāʾūd 4971)
أَنَّهُ سَمِعَ رَسُولَ اللهِ ﷺ يَقُولُ «كَفَى بِهَا خِيَانَةً أَنْ تُحَدِّثَ أَخَاكَ حَدِيثًا هُوَ لَكَ بِهِ مُصَدِّقٌ وَأَنْتَ بِهِ كَاذِبٌ»