Surah Taha 20:6

لَهُۥ مَا فِى ٱلسَّمَـٰوَٰتِ وَمَا فِى ٱلْأَرْضِ وَمَا بَيْنَهُمَا وَمَا تَحْتَ ٱلثَّرَىٰ

To Him belongs what is in the heavens and what is on the earth and what is between them and what is under the soil.

Translation: Saheeh International

Tafsir

to Him belongs whatever is in the heavens and whatever is in the earth and whatever is between them of creatures and whatever is beneath the soil al-tharā is moist earth meaning whatever is beneath the seven earths since these lie beneath it.

Excerpt from Tafsir al-Jalalayn, commentary on 20:6, via Quran.com. The reader has the full commentary and 9 more tafsirs.