I am a Shia Muslim and I read an article by Sayyid A. Amiruddin that says that Prophet Muhammad (s) was from the tribe of David and he mentioned a Hadith attributed to Imam Jafar Sadiq as evidence. Does there exist such a narration?
We don't have such narration suggesting the Prophet Muhammad (SAWA) is from the tribe David. David is from Ishaq (AS) while Prophet Muhammad is from Ismael (AS).
You need to ask the person who claims that to provide authentic evidence supporting his claim.
Wassalam.