15:99
وَٱعْبُدْ رَبَّكَ حَتَّىٰ يَأْتِيَكَ ٱلْيَقِينُ
wa-uʿ'bud rabbaka ḥattā yatiyaka l-yaqīnu
And worship your Lord until there comes to you the certainty [i.e., death].
— Saheeh International
worship your Lord until what is certain comes to you.
— M. A. S. Abdel Haleem
And worship your Lord until there comes unto you the certainty (i.e. death).
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali