AL AN'AAM — Ayat 88

ذَلِكَ هُدَى اللّهِ يَهْدِي بِهِ مَن يَشَاء مِنْ عِبَادِهِ وَلَوْ أَشْرَكُواْ لَحَبِطَ عَنْهُم مَّا كَانُواْ يَعْمَلُونَ

That is the guidance of Allah by which He guides whomever He wills of His servants. But if they had associated others with Allah , then worthless for them would be whatever they were doing.