"And by it they act justly," meaning: they judge.
Surat al-A'raf from verse (160) to verse (162).
﴿وَبِه يعدلُونَ﴾ يحكمون.
سُورَة الْأَعْرَاف من الْآيَة (١٦٠) إِلَى الْآيَة (١٦٢).
