Surah Al-Ma'arij 70:34

وَٱلَّذِينَ هُمْ عَلَىٰ صَلَاتِهِمْ يُحَافِظُونَ

And those who [carefully] maintain their prayer:

Translation: Saheeh International

Tafsir

and who preserve their prayers by observing them in their appointed times.

Excerpt from Tafsir al-Jalalayn, commentary on 70:34, via Quran.com. The reader has the full commentary and 9 more tafsirs.