73. Muzemil · verses 17–18

فَكَيۡفَ تَتَّقُونَ إِن كَفَرۡتُمۡ يَوۡمٗا يَجۡعَلُ ٱلۡوِلۡدَٰنَ شِيبًا

Fakayfa tattaqoona in kafartum yawman yajAAalu alwildana sheeban

Then how shall ye, if ye deny (Allah), guard yourselves against a Day that will make children hoary-headed?-

ٱلسَّمَآءُ مُنفَطِرُۢ بِهِۦۚ كَانَ وَعۡدُهُۥ مَفۡعُولًا

Alssamao munfatirun bihi kana waAAduhu mafAAoolan

Whereon the sky will be cleft asunder? His Promise needs must be accomplished.