The Messenger of Allah ﷺ said, "Do not lie about me, for whoever lies about me will enter the Fire."
حدثنا يحيى عن شعبة حدثنا منصور قال سمعت ربعيا قال سمعت
قال رسول الله ﷺ لا تكذبوا علي فإنه من يكذب علي يلج النار
Its isnad is sahih. Mansur is Ibn Mutamir. Rabi bin Harash was a trustworthy Follower and one of the best of people. Rubai is spelled with a kasrah on the ra, a sukun on the ba, a kasrah on the ayn, and a doubled ya. Harrash is spelled with a kasrah on the ha, a light ra, and ends with a dotted shin. See 584. See also 1000 and 1001, where we discussed whether Rubai heard directly from Ali.