Sura Fuṣṣilat 41:12

فَقَضَىٰهُنَّ سَبْعَ سَمَٰوَاتٍ فِى يَوْمَيْنِ وَأَوْحَىٰ فِى كُلِّ سَمَآءٍ أَمْرَهَا وَزَيَّنَّا ٱلسَّمَآءَ ٱلدُّنْيَا بِمَصَٰبِيحَ وَحِفْظًا ذَٰلِكَ تَقْدِيرُ ٱلْعَزِيزِ ٱلْعَلِيمِ

fa-qaḍāhunna sabʿa samāwātin fī yawmayni wa-awḥa fī kulli samāʾin amrahā wa-zayyannā l-samāʾa l-dunyā bi-maṣābīḥa wa-ḥifẓan dhālika taqdīru l-ʿazīzi l-ʿalīmi

So He completed them as seven firmaments in two Days, and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge.