The Quran

قُل أَرَأَيتُم إِن كانَ مِن عِندِ اللَّهِ وَكَفَرتُم بِهِ وَشَهِدَ شاهِدٌ مِن بَني إِسرائيلَ عَلىٰ مِثلِهِ فَآمَنَ وَاستَكبَرتُم ۖ إِنَّ اللَّهَ لا يَهدِي القَومَ الظّالِمينَ

Muhammad Asad

Say: "Have you given thought [to how you will fare] if this be truly [a revelation] from God and yet you deny its truth? - even though a witness from among the children of Israel has already borne witness to [the advent of] one like himself,¹ and has believed [in him], the while you glory in your arrogance [and reject his message]? Verily, God does not grace [such] evildoing folk with His guidance!"

I.e., a prophet like himself. The "witness" spoken of here is evidently Moses: cf. the two Biblical passages relating to the advent of the Prophet Muhammad (Deuteronomy xviii, 15 and 18): "The Lord thy God will raise up unto thee a prophet from the midst of thee, of thy brethren, like unto me"; and "I will raise them up a prophet from among thy brethren, like unto thee, and will put My words in his mouth." (See in this connection note 33 on 2:42.)