The Quran

255

اللَّهُ لا إِلٰهَ إِلّا هُوَ الحَيُّ القَيّومُ ۚ لا تَأخُذُهُ سِنَةٌ وَلا نَومٌ ۚ لَهُ ما فِي السَّماواتِ وَما فِي الأَرضِ ۗ مَن ذَا الَّذي يَشفَعُ عِندَهُ إِلّا بِإِذنِهِ ۚ يَعلَمُ ما بَينَ أَيديهِم وَما خَلفَهُم ۖ وَلا يُحيطونَ بِشَيءٍ مِن عِلمِهِ إِلّا بِما شاءَ ۚ وَسِعَ كُرسِيُّهُ السَّماواتِ وَالأَرضَ ۖ وَلا يَئودُهُ حِفظُهُما ۚ وَهُوَ العَلِيُّ العَظيمُ

(Saheeh International)

Allāh – there is no deity except Him, the Ever-Living, the Sustainer of [all] existence. Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is [presently] before them and what will be after them,¹ and they encompass not a thing of His knowledge except for what He wills. His Kursī² extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High, the Most Great.

Allāh's knowledge encompasses every aspect of His creations in the past, present and future.
Chair or footstool. It is not to be confused with al-‘Arsh (the Throne), which is infinitely higher and greater than al-Kursī.