﴿ أَوَلَمْ يَكُن لَّهُمْ ءَايَةً أَن يَعْلَمَهُۥ عُلَمَٰٓؤُا۟ بَنِىٓ إِسْرَٰٓءِيلَ ﴾

“Is it not evidence enough for them that [so many] learned men from among the children of Israel have recognized this [as true]?”

(Is it not a token) a sign for the prophethood of Muhammad, Allah bless him and give peace, (for them) for the people of Mecca (that the doctors of the Children of Israel know it?) That is, when they asked them about Muhammad (pbuh) and the Qur'an and they informed them about both.