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Since it is obviously impossible to attribute to a prophet the levity of scoffing (Baghawi), the meaning of the above phrase seems to be this: "If you consider us ignorant because of what we believe and are doing, we consider you ignorant because of your refusal to acknowledge the truth and your readiness to expose yourselves to God's punishment" (Zamakhshari and, in a shorter form, Baghawi). Hence my interpolation of the words "and your ignorance".
The ridicule of the sinners, from their own point of view, was natural. Here was a Prophet turned carpenter! Here was a plain in the higher reaches of the Mesopotamian basin, drained by the majestic Tigris, over 800 to 900 miles from the sea Arabian Gulf in a straight line! Yet he talks of a flood like the Sea! All material civilisations pride themselves on their Public Works and their drainage schemes. And here was a fellow relying on Allah! But did not their narrow pride seem ridiculous also to the Prophet of Allah! Here were men steeped in sin and insolence! And they pit themselves against the power and the promise of Allah! Truly a contemptible race is man!
The Arabic Aorist may be construed either by the present tense or the future tense, and both make good sense here. Following Zamakhshari, I construe in the present tense, because the future is so tragic for the sinners. For the time being the worldly ones looked down on the Believers as they always do: but the Believers relied on Allah, and pitied their critics for knowing no better!-for their arrogance was really ridiculous.