Allatheena hum AAala salatihim da-imoon (surah Maarij: 23)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(70:23) and are constant in their Prayer; *15

Allazeena hum `alaa Salaatihim daaa`imoon

*15) That is, no laziness, or love of ease and comfort, no occupation, or interest, hinders them from being punctual and regular at the prayer. When the Prayer time comes, they abandon every occupation and activity and stand up to perform worship of their God. Another meaning which Hadrat 'Uqbah bin 'Amir has given of ala salat-i-him daa imun is that they perform the Prayer with full peace of mind, tranquillity and humility; they do not try to offer the Prayer in a hurry in order to get rid of it somehow, nor think irrelevant things during the Prayer.