99وَاعبُد رَبَّكَ حَتّىٰ يَأتِيَكَ اليَقينُMuhammad Asadand worship thy Sustainer till death comes to thee.1Lit., "till there comes unto thee that which is certain (al-yagin)" - a term which in the Qur'an is often used as a metonym for "death" (Bukhari, Kitab-at-Tafsir). However, see also the earliest occurrence of this term in 74:47.