Al-Hijr • EN-AL-JALALAYN
﴿ وَأَنَّ عَذَابِى هُوَ ٱلْعَذَابُ ٱلْأَلِيمُ ﴾
“and [also,] that the suffering which I shall impose [on sinners] will indeed be a suffering most grievous.”
and that My chastisement of those who are disobedient is the painful chastisement.