Surah Al-Muzzammil — Ayah 8 (73:8)
وَٱذۡكُرِ ٱسۡمَ رَبِّكَ وَتَبَتَّلۡ إِلَيۡهِ تَبۡتِيلٗا ٨
English translation (Saheeh International)
And remember the name of your Lord and devote yourself to Him with [complete] devotion.
Brief commentary
Remember Allah with various forms of remembrance, and devote yourself to Him (may He be glorified) fully by making your worship solely for Him.