Al-Ma'aarij • AR-TAFSIR-IBN-KATHIR
﴿ فَلَآ أُقْسِمُ بِرَبِّ ٱلْمَشَٰرِقِ وَٱلْمَغَٰرِبِ إِنَّا لَقَٰدِرُونَ ﴾
“But nay! I call to witness [Our being] the Sustainer of all the points of sunrise and sunset: verily, well able are We”
أي أقسم. و"لا" صلة.