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And there are some of them who listen to you, when you recite, and We have placed veils, covers, upon their hearts so that they do not understand it, [so that] they [do not] comprehend the Qur'ān; and in their ears a heaviness, a deafness, so that they do not hear it with a willingness to accept it. And if they were to see every sign, they would not believe in it, so that when they come to you to argue with you, the disbelievers say, 'This, Qur'ān, is nothing but the fables, the lies, of the ancients', similar to [their] jokes and strange tales (asātīr, 'fables', is the plural of ustūra).