Surah Qaf 50:40

وَمِنَ ٱلَّيْلِ فَسَبِّحْهُ وَأَدْبَـٰرَ ٱلسُّجُودِ

And [in part] of the night exalt Him and after prostration [i.e., prayer].

Translation: Saheeh International

Tafsir

and glorify Him at some part of the night that is to say perform the two evening prayers and after prostrations read adbār as the plural of dubur or idbār as the verbal noun from adbara ‘to pass’ in other words perform supererogatory prayers as prescribed by the Sunna after the obligatory ones; …

Excerpt from Tafsir al-Jalalayn, commentary on 50:40, via Quran.com. The reader has the full commentary and 9 more tafsirs.