﴿ وَٱذْكُرِ ٱسْمَ رَبِّكَ وَتَبَتَّلْ إِلَيْهِ تَبْتِيلًۭا ﴾

“But [whether by night or by day,] remember thy Sustainer's name, and devote thyself unto Him with utter devotion.”

(So remember the name of thy Lord) so pray by the command of your Lord; and it is also said this means: remember your Lord's divine Oneness (and devote thyself with a complete devotion) be completely sincere to Allah in your prayers, supplications and acts of worship.