Key Verses

1. 26:89Ash-Shuara
   إِلَّا مَنۡ أَتَى ٱللَّهَ بِقَلۡبٖ سَلِيمٖ
   Save him who bringeth unto Allah a whole heart.
   In context

   Except for the one who brings a perfect heart: one free of idolatry, hypocrisy, ostentation and arrogance. That is because he would have benefitted from his wealth which was spent in the path of Allah and his children, who would pray for him.

2. 37:84As-Saffat
   إِذۡ جَآءَ رَبَّهُۥ بِقَلۡبٖ سَلِيمٍ
   When he came unto his Lord with a whole heart;
   In context

   Remember when he came to his Lord with a heart pure from ascribing partners to Allah and from doubts, full of sincerity to Allah only wanted good for the creation.