There were two delegations of Muslims who fled Makkah to Abyssinia due to the persecution of Quraysh. After Muslims were given protection in Abyssinia, there were eight Abyssinians who accepted Islam, then left Abyssinia to Al-Madinah with Ja’far bin Abi Talib (RA).
Those men were Abrahah, Idris, Ashraf, Ayman, Bahir, Tammam, Tamim and Nafi’.
Al-Isbah by ibn Hajr Al-Asqalani states that Tammam was a Jewish rabbi before accepting Islam.
Relating to Surah Al-Qasas, ayah 52 which states, “Those to whom We gave the scripture before, they believe in it [Al-Qur’an],” Al-Mawardi in his tafsir stated that one opinion is that this ayah is related to those eight Abyssinians who were from the People of the Book that accepted Islam.
May Allah (SWT) be pleased with them.