Surah Al-Mu'minun 23:86

قُلْ مَن رَّبُّ ٱلسَّمَـٰوَٰتِ ٱلسَّبْعِ وَرَبُّ ٱلْعَرْشِ ٱلْعَظِيمِ

Say, "Who is Lord of the seven heavens and Lord of the Great Throne?"

Translation: Saheeh International

Tafsir

Say ‘Who is the Lord of the seven heavens and the Lord of the Great Throne?’ that is the throne kursī.

Excerpt from Tafsir al-Jalalayn, commentary on 23:86, via Quran.com. The reader has the full commentary and 9 more tafsirs.