Surah Luqman (Luqman), Verse 23

وَمَنْ كَفَرَ فَلَا یَحْزُنْكَ كُفْرُهٗ اِلَیْنَا مَرْجِعُهُمْ فَنُنَبِّئُهُمْ بِمَا عَمِلُوْا اِنَّ اللّٰهَ عَلِیْمٌۢ بِذَاتِ الصُّدُوْرِ ۟

Wa man kafara falaa yahzunka kufruh; ilainaa marji'uhum fanunabbi'uhum bimaa 'amiloo; innal laaha 'aleemum bizaatis sudoor

“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.”

Quran 31:23 (Yusuf Ali Translation)