I was sitting in a study circle in Kufa when a man began narrating. He said, "We were sitting with Abu Hurairah, and he said, 'I heard the Messenger of Allah ﷺ say, "Whoever bears witness against a Muslim with testimony he is not entitled to give, let him take his seat in the Fire."'"
حدثنا يزيد أخبرنا جهير بن يزيد العبدي
كنت في حلقة بالكوفة فإذا رجل يحدث قال كنا جلوسا مع أبي هريرة فقال سمعت رسول الله ﷺ يقول من شهد على مسلم شهادة ليس لها بأهل فليتبوأ مقعده من النار
No references are available.
Its isnad is daif, containing an unknown narrator, while the rest of its narrators are trustworthy. Haythami said the same in Majma 4/200, as did Munziri in Targheeb 3/222.