"And that is not difficult for Allah," meaning: it is not burdensome for Him.
Surah Ibrahim from verse (21) to verse (23).
﴿وَمَا ذَلِكَ عَلَى اللَّهِ بِعَزِيزٍ﴾ أَي: لَا يشق عَلَيْهِ.
سُورَة إِبْرَاهِيم من الْآيَة (٢١) إِلَى الْآيَة (٢٣).