Luqman - 31:23

وَمَن كَفَرَ فَلَا يَحْزُنكَ كُفْرُهُ إِلَيْنَا مَرْجِعُهُمْ فَنُنَبِّئُهُم بِمَا عَمِلُوا إِنَّ اللَّهَ عَلِيمٌ بِذَاتِ الصُّدُورِ
[31:23]
And whoever disbelieves, let not his disbelief grieve you; to Us is their return, then will We inform them of what they did surely Allah is the Knower of what is in the breasts.
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.
And whosoever disbelieveth, let not his disbelief afflict thee (O Muhammad). Unto Us is their return, and We shall tell them what they did. Lo! Allah is Aware of what is in the breasts (of men).