لَأُعَذِّبَنَّهُ عَذَابًا شَدِيدًا أَوْ لَأَذْبَحَنَّهُ أَوْ لَيَأْتِيَنِّي بِسُلْطَانٍ مُّبِينٍ
[27:21]
I will most certainly punish him with a severe punishment, or kill him, or he shall bring to me a clear plea.
"I will certainly punish him with a severe penalty, or execute him, unless he bring me a clear reason (for absence)."
I verily will punish him with hard punishment or I verily will slay him, or he verily shall bring me a plain excuse.