لَأُعَذِّبَنَّهُۥ عَذَابًۭا شَدِيدًا أَوْ لَأَا۟ذْبَحَنَّهُۥٓ أَوْ لَيَأْتِيَنِّى بِسُلْطَٰنٍۢ مُّبِينٍۢ
How to read it
La'uʻadhdhibannahu ʻadhāban shadīdan 'aw' la'ādh'baḥannahu 'aw' laya''tiyannī bissulṭānin mmubīnin
"I will certainly punish him with a severe penalty, or execute him, unless he bring me a clear reason (for absence)."
Translation: Abdullah Yusuf Ali

