Which Allah imposed upon them for seven nights and eight days in succession, so you would see the people therein fallen as if they were hollow trunks of palm trees.
The Saheeh International Quran Translation
سَخَّرَهَا عَلَيْهِمْ سَبْعَ لَيَالٍ وَثَمَٰنِيَةَ أَيَّامٍ حُسُومًا فَتَرَى ٱلْقَوْمَ فِيهَا صَرْعَىٰ كَأَنَّهُمْ أَعْجَازُ نَخْلٍ خَاوِيَةٍWhich Allah imposed upon them for seven nights and eight days in succession, so you would see the people therein fallen as if they were hollow trunks of palm trees.