23:9

وَالَّذِينَ هُمْ عَلَىٰ صَلَوَاتِهِمْ يُحَافِظُونَ

Transliteration:

Waallatheena hum AAala salawatihim yuhafithoona

Word by Word:

And those who [they] over their prayers they guard

Translations:

and who guard their prayers [from all worldly intent].

And who (strictly) guard their prayers;-

And who pay heed to their prayers.

And those who keep a guard on their prayers.

And they who carefully maintain their prayers -