Sincerity and purity of intention (ikhlas)

وَمَآ أَسْـَٔلُكُمْ عَلَيْهِ مِنْ أَجْرٍ ۖ إِنْ أَجْرِىَ إِلَّا عَلَىٰ رَبِّ ٱلْعَـٰلَمِينَ

And I do not ask you for it any payment. My payment is only from the Lord of the worlds.

وَمَآ أَسْـَٔلُكُمْ عَلَيْهِ مِنْ أَجْرٍ ۖ إِنْ أَجْرِىَ إِلَّا عَلَىٰ رَبِّ ٱلْعَـٰلَمِينَ

And I do not ask you for it any payment. My payment is only from the Lord of the worlds.

إِلَّا عِبَادَ ٱللَّهِ ٱلْمُخْلَصِينَ

Except the chosen servants of Allāh.