Surah Taha, Verse 48:

إِنَّا قَدْ أُوحِيَ إِلَيْنَا أَنَّ الْعَذَابَ عَلَىٰ مَن كَذَّبَ وَتَوَلَّىٰ

'Truly, it has been revealed to us that the torment will be for him who denies [believes not in the Oneness of Allah, and in His Messengers, etc.], and turns away.'(from the truth and obedience of Allah)"