'Adi ibn Arta' said, "When one of the Companions of the Prophet, may Allah bless him and grant him peace, was praised, he said in supplication to Allah), 'Do not take me to task for what they say and forgive me for what they do not know.'"  

عَنْ عَدِيِّ بْنِ أَرْطَأَةَ قَالَ كَانَ الرَّجُلُ مِنْ أَصْحَابِ النَّبِيِّ ﷺ إِذَا زُكِّيَ قَالَ اللَّهُمَّ لاَ تُؤَاخِذْنِي بِمَا يَقُولُونَ وَاغْفِرْ لِي مَا لا يَعْلَمُونَ  

Abu Qilaba reported that 'Abdullah said to Abu Mas'ud - or Abu Mas'ud said to 'Abdullah, "What did you hear the Prophet, may Allah bless him and grant him peace, say about '(false) assertion?" He said, "It is a bad mount for a man."  

أَنَّ أَبَا عَبْدِ اللهِ قَالَ لأَبِي مَسْعُودٍ أَوْ أَبُو مَسْعُودٍ قَالَ لأَبِي عَبْدِ اللهِ مَا سَمِعْتَ النَّبِيَّ ﷺ فِي ( زَعَمَ )؟ قَالَ بِئْسَ مَطِيَّةُ الرَّجُلِ  

'Abdullah ibn 'Amr said, "Abu Mas'ud, what did you hear the Messenger of Allah, may Allah bless him and grant him peace, say about 'People who make false claims?" He replied, "I heard him say, 'A bad mount for a man' and I heard him say, 'Cursing a believer is like killing him.'"  

سَمِعْتَ رَسُولَ اللهِ ﷺ يَقُولُ فِي زَعَمُوا؟ قَالَ سَمِعْتُهُ يَقُولُ بِئْسَ مَطِيَّةُ الرَّجُلِ وَسَمِعْتُهُ يَقُولُ لَعْنُ الْمُؤْمِنِ كَقَتْلِهِ