Surah Al-Mu'minun, ayah 9

وَٱلَّذِينَ هُمۡ عَلَىٰ صَلَوَٰتِهِمۡ يُحَافِظُونَ ٩

Walladhīna hum 'alā salawātihim yuhāfizūn

And they who carefully maintain their prayers -