Surah Al-Qalam, ayah 33

68:33

كَذَٰلِكَ ٱلۡعَذَابُۖ وَلَعَذَابُ ٱلۡأٓخِرَةِ أَكۡبَرُۚ لَوۡ كَانُواْ يَعۡلَمُونَ ٣٣

Kadhālikal-'adhābu wala'adhābul-ākhirati akbaru law kānū ya'lamūn

Such is the punishment [of this world]. And the punishment of the Hereafter is greater, if they only knew.