Surah Al-Furqan 25:64

وَٱلَّذِينَ يَبِيتُونَ لِرَبِّهِمْ سُجَّدًا وَقِيَـٰمًا

And those who spend [part of] the night to their Lord prostrating and standing [in prayer]

Translation: Saheeh International

Tafsir

and who spend the night before their Lord prostrating sujjad is the plural of sājid and standing in worship in other words they spend the night performing prayers;

Excerpt from Tafsir al-Jalalayn, commentary on 25:64, via Quran.com. The reader has the full commentary and 9 more tafsirs.