"And indeed, it is in the scriptures of the former peoples," meaning the books of the ancients. He says: The description of Muhammad and his nation is in their books; meaning the Torah and the Gospel.
﴿وَإنَّهُ لفي زبر الْأَوَّلين﴾ كُتُبِ الْأَوَّلِينَ؛ يَقُولُ: نَعْتُ مُحَمَّدٍ وَأُمَّتِهِ فِي كُتُبِهِمْ؛ يَعْنِي: التَّوْرَاةَ وَالْإِنْجِيل