﴿ يَوْمَ تَمُورُ ٱلسَّمَآءُ مَوْرًۭا ﴾

“[It will come to pass] on the Day when the skies will be convulsed in [a great] convulsion,”

(On the day when the heaven will heave) will rotate (with (awful) heaving) with its inhabitants on like the rotation of a millstone, and created beings will surge on each other because of the terror they see.