ذٰلِكَ هُدَى اللَّهِ يَهدي بِهِ مَن يَشاءُ مِن عِبادِهِ ۚ وَلَو أَشرَكوا لَحَبِطَ عَنهُم ما كانوا يَعمَلونَ

This is God’s guidance; with it, He guides whomever He wills among His servants. If they were to associate others with Him, then all their deeds would be nullified.