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Lit., "till there comes unto thee that which is certain (al-yaqin)" - 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 .
i.e., lit., what is certain—death.
Yaqin: Certainty; the Hour that is Certain; death.