وإذ تأذن ربك ليبعثن عليهم إلى يوم القيامة من يسومهم سوء العذاب إن ربك لسريع العقاب وإنه لغفور رحيم
And when declared your Lord that He would surely send upon them till (the) Day (of) the Resurrection (those) who would afflict them (with) a grievous [the] punishment. Indeed, your Lord (is) surely Swift in Punishment, but indeed, He (is) surely Oft-Forgiving, Most Merciful.