Surah Ad-Dukhan, Verse 7

رَبِّ ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِ وَمَا بَيۡنَهُمَآۖ إِن كُنتُم مُّوقِنِينَ٧

rabbi l-samāwāti wal-arḍi wamā baynahumā in kuntum mūqinīna

Lord of the heavens and the earth and that between them, if you would be certain.