Question Summary:
Was the Israelite a Muslim?

Question Detail:

when the israaeelee and the egyption were fighting -and musa (alayhissalam) killed the egyption by accident as he was trying to protect the israaeelee? was the israeelee a muslim?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The incident of the Coptic’s death took place after Nabi Musa AS announced his prophet hood. The Quran refers to the Israeli as “from his group”. The commentators mention these words indicate he was from amongst the disciples of Musa AS and that he had Imān.[1]
 
And Allah Ta’āla Knows Best
Mawlana Ali bin Cassim,
Student Darul Iftaa
Los Angeles, U.S.A
Checked and Approved by,
Mufti Ebrahim Desai.