He knows best as to who is conscious of Him.

وَلِلَّهِ مَا فِي السَّمَاوَاتِ وَمَا فِي الْأَرْضِ لِيَجْزِيَ الَّذِينَ أَسَاؤُوا بِمَا عَمِلُوا وَيَجْزِيَ الَّذِينَ أَحْسَنُوا بِالْحُسْنَى

53:31 Indeed, unto God belongs all that is in the heavens and all that is on earth: and so He will reward those who do evil in accordance with what they did, and will reward those who do good with ultimate good.

الَّذِينَ يَجْتَنِبُونَ كَبَائِرَ الْإِثْمِ وَالْفَوَاحِشَ إِلَّا اللَّمَمَ إِنَّ رَبَّكَ وَاسِعُ الْمَغْفِرَةِ هُوَ أَعْلَمُ بِكُمْ إِذْ أَنشَأَكُم مِّنَ الْأَرْضِ وَإِذْ أَنتُمْ أَجِنَّةٌ فِي بُطُونِ أُمَّهَاتِكُمْ فَلَا تُزَكُّوا أَنفُسَكُمْ هُوَ أَعْلَمُ بِمَنِ اتَّقَى

53:32 As for those who avoid the [truly] grave sins and shameful deeds - even though they may sometimes stumble behold, thy Sustainer is abounding in forgiveness. He is fully aware of you when He brings you into being out of dust, and when you are still hidden in your mothers' wombs: do not, then, consider yourselves pure - [for] He knows best as to who is conscious of Him.

[Najm :31-32]