Was there an interpreter between Jafar and Najashi when Jafar recited from Surat Maryam, and is what was narrated by Umm Salamah about the weeping of Najashi and the bishops authentic? And what is authentic regarding the emigration to Abyssinia?

It is probable that the Negus understood what was recited to him from the Quran during the Abyssinian migration for several reasons: the presence of an interpreter, or Ja'far's proficiency in the Abyssinian language due to his long stay there, or the Negus's knowledge of the Arabic language given that he lived for a period in Arab lands. There is no explicit historical text that definitively resolves this matter.