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Mention, the day when the shank is bared - an expression denoting the severity of the predicament during the reckoning and the requital on the Day of Resurrection: one says kashafati'l-harbu 'an sāqin, 'the war has bared its shank', to mean that it has intensified) and they are summoned to prostrate themselves, as a test of their faith, but they will not be able [to do so] - their backs will become as [stiff as] a brick wall.