Quran 69:7 Al-Haqqah, ayah 7 of 52

سَخَّرَهَا عَلَيْهِمْ سَبْعَ لَيَالٍ وَثَمَـٰنِيَةَ أَيَّامٍ حُسُومًا فَتَرَى ٱلْقَوْمَ فِيهَا صَرْعَىٰ كَأَنَّهُمْ أَعْجَازُ نَخْلٍ خَاوِيَةٍ ۝٧

69:7 Which He imposed on them for seven long nights and eight long days so that thou mightest have seen men lying overthrown, as they were hollow trunks of palm-trees.