"Say, believe in it," meaning: the Qur'an, which He says to the polytheists, "or do not believe. Indeed, those who were given knowledge before it," before the Qur'an; meaning: the believers from the People of the Book, "when it is..."
﴿قل آمنُوا بِهِ﴾ يَعْنِي: الْقُرْآنَ يَقُولُهُ لِلْمُشْرِكِينَ ﴿أَوْ لَا يُؤمنُوا إِنَّ الَّذِينَ أُوتُوا الْعِلْمَ مِنْ قبله﴾ قَبْلَ الْقُرْآنِ؛ يَعْنِي: الْمُؤْمِنِينَ مِنْ أَهْلِ الْكِتَابِ (إِذَا