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Allahu ta’ālā has prepared for them a severe chastisement (the reiteration of the threat is for emphasis). So fear Allahu ta’ālā, O people of pith, O possessors of intellect, [you] who believe! (this is a description of the vocative, or an explication of it) Allahu ta’ālā has certainly revealed to you a [source of] remembrance, that is, the Qur'ān;