Surah Al-Ma'arij 70:23
ٱلَّذِينَ هُمْ عَلَىٰ صَلَاتِهِمْ دَآئِمُونَ
Those who are constant in their prayer
Translation: Saheeh International
Tafsir
those who maintain those who regularly observe their prayers
Excerpt from Tafsir al-Jalalayn, commentary on 70:23, via Quran.com. The reader has the full commentary and 9 more tafsirs.