Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 23329a
"مَنْ مَشَى مَعَ قَوْمٍ يَرى أَنَّهُ شَاهِدٌ وَلَيسَ بشَاهِدٍ، فَهُوَ شَاهدُ زُورٍ، وَمَنْ أَعَانَ عَلَى خُصُوَمةٍ بِغَيرِ عِلمٍ كَانَ في سُخْطِ اللهِ حَتَّى يَنْزعَ، وَقِتَالُ المؤمِن كفْرٌ، وَسِبابهُ فُسُوقٌ".
Translation
Machine translation, not reviewed
"Whoever walks with a people, thinking he is a witness while he is not a witness, he is a false witness. Whoever helps in a dispute without knowledge remains under the anger of Allah until he withdraws. Fighting a believer is disbelief, and insulting him is sinfulness."
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Notes
[ق] البيهقى في السنن عن أبي هريرة، وروى الديلمي صَدْرَه عن ابن عباس
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