"And those who hold fast to the Book." Mujahid said: It means those who believe from among the Jews and the Christians.
Surah al-A'raf from verse (171) to verse (174).
﴿وَالَّذين يمسكون بِالْكتاب﴾ قَالَ مُجَاهِدٌ: يَعْنِي: مَنْ آمَنَ من الْيَهُود وَالنَّصَارَى.
سُورَة الْأَعْرَاف من الْآيَة (١٧١) إِلَى الْآيَة (١٧٤).