Surah Ar-Rahman 55:20

بَيْنَهُمَا بَرْزَخٌ لَّا يَبْغِيَانِ

Between them is a barrier so neither of them transgresses.

Translation: Saheeh International

Tafsir

Between them there is a barrier by His power exalted be He. They do not overstep neither of the two encroaches upon the other to become mixed with it.

Excerpt from Tafsir al-Jalalayn, commentary on 55:20, via Quran.com. The reader has the full commentary and 9 more tafsirs.