Quran 70:23 from Surah Al-Ma'aarij on Divine Marvels.
ٱلَّذِينَ هُمۡ عَلَىٰ صَلَاتِهِمۡ دَآئِمُونَ
English translation: Those who [they] at their prayer (are) constant
Transliteration: alladhina hum ala salatihim daimuna