Hadith 1004
Narrated Abu Hurairah: The Prophet ﷺ said: Shortening the salutation is sunnah (commendable). The narrator 'Isa said: Ibn al-Mubarak prohibited me from reporting this tradition as a statement of the Prophet ﷺ. Abu Dawud said: I heard Abu Umar 'Isa bin Yunus al-Fakhuri al-Ramil saying: When al-Firyabi returned from Makkah, he gave up narrating this tradition as a statement of the Prophet ﷺ. He said: Ahmad bin Hanbal forbade to report this tradition directly from the Prophet ﷺ.