Quran 23:9 from Surah Al-Muminoon on Divine Marvels.
وَٱلَّذِينَ هُمۡ عَلَىٰ صَلَوَٰتِهِمۡ يُحَافِظُونَ
English translation: And those who [they] over their prayers they guard
Transliteration: wa-alladhina hum ala salawatihim yuhafizuna