الَّذِينَ آتَيْنَاهُمُ الْكِتَابَ مِن قَبْلِهِ هُم بِهِ يُؤْمِنُونَ
Those to whom We gave the Book before it are the ones who believe in it,
Agha Ali Puya Commentary
Commentary on Quran 28:52
[Pooya/Ali Commentary 28:52] These two verses are said to have come in praise of those 32 Christians who had come from Abyssinia with the Holy Prophet's cousin Jafar Tayyar and 8 from Syria including Buhayra. These converts, even before their open declaration of Islam, are called Muslims or those who had submitted themselves to the will of Allah. In this sense, it will be true to call all the prophets of Allah preceding the Holy Prophet as Muslims because there could not be a prophet of Allah who would not have submitted himself to Allah's will. Similarly, extending the argument further, there cannot be any doubt about Abu Talib, under whose protection Islam and the Holy Prophet lived to thrive and flourish, being a Musllm.