Allah(swt), Knows everything

 وَمَن كَفَرَ فَلَا يَحْزُنكَ كُفْرُهُ إِلَيْنَا مَرْجِعُهُمْ فَنُنَبِّئُهُم بِمَا عَمِلُوا إِنَّ اللَّهَ عَلِيمٌ بِذَاتِ الصُّدُورِ 31:23

(Fathe Muhammad Jalandari)
اور جو کفر کرے تو اُس کا کفر تمہيں غمناک نہ کردے ان کو ہماري طرف لوٹ کر آنا ہے پھر جو کام وہ کيا کرتے تھے ہم اُن کو جتا ئيں گے. بيشک خدا دلوں کي باتوں سے واقف ہے 31:23

(Muhammad Assad)
 31:23 But as for him who is bent on denying the truth - let not his denial grieve thee: unto Us they must return, and then We shall make them [truly] understand all that they were doing [in life]: for, verily, God has full knowledge of what is in the hearts [of men].31:23

(Yousaf Ali)
 31:23 But if any reject Faith, let not his rejection grieve thee: to Us is their return, and We shall tell them the truth of their deeds: for Allah knows well all that is in (men's) hearts.31:23