37:84
إِذْ جَآءَ رَبَّهُۥ بِقَلْبٍ سَلِيمٍ
idh jāa rabbahu biqalbin salīmin
he came to his Lord with a devoted heart.
When he came to his Lord with a pure heart [attached to Allâh Alone and none else, worshipping none but Allâh Alone - true Islâmic Monotheism, pure from the filth of polytheism].