Can you please provide the original source as well as authenticity of this narration?
لا تغل أخاك المسلم
Do not hate your Muslim brother
This is part of a lengthy narration recorded in At Tadwin Fi Akhbari Qazwin and other sources on the authority of Sayyiduna Salman Al Farisi (radiyallahu ‘anhu). The Hadith is known as ‘Forty Hadiths on etiquette’.
(At Tadwin Fi Akhbari Qazwin, vol. 3 pg. 375. Also see: Kanzul ‘Ummal, Hadith: 29467)
However, ‘Allamah Dhahabi (rahimahullah) and others have declared this Hadith a fabrication.
(Mizanul I’tidal, vol. 2 pg. 98, number: 2869, Lisanul Mizan, vol. 3 pg. 557, number: 3297. Also see: Tarikh Dimashq, vol. 43 pg. 145 and Mizanul I’tidal, vol. 4 pg. 26, number: 6715 and Lisanul Mizan, vol. 4 pg. 29, number: 3379)
And Allah Ta’ala Knows best.
Answered by: Moulana Suhail Motala
Approved by: Moulana Muhammad Abasoomar