Al Muzzammil, 8 Ayah
73:8
وَٱذۡكُرِ ٱسۡمَ رَبِّكَ وَتَبَتَّلۡ إِلَيۡهِ تَبۡتِيلٗا ٨
Wa Adhkur Asma Rabbika Wa Tabattal 'Ilayhi Tabtīlāan
And remember the name of your Lord and devote yourself to Him with [complete] devotion.