وَاذْكُرِ اسْمَ رَبِّكَ وَتَبَتَّلْ إِلَيْهِ تَبْتِيلًا
[73:8]
And remember the name of your Lord and devote yourself to Him with (exclusive) devotion.
But keep in remembrance the name of thy Lord and devote thyself to Him whole-heartedly.
So remember the name of thy Lord and devote thyself with a complete devotion -