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Lit., "inventing a lie about God".
An expression of humility, and not of the idea that God might "will" them to blaspheme.
Or: "Thou art the best of all deciders" - since the verb fataha can also be rendered as "he decided". However, Shu'ayb's prayer could not have implied a request for God's "decision" (for there was no doubt in his mind as to who was right), and therefore the primary significance of iftah ("lay open") and fatih ("one who lays open", i.e., the truth) is preferable.
This, of course, does not mean that anyone can ever return to evil ways with Allah's consent. Shu'aib has already emphatically repudiated the idea of returning "to your ways after Allah hath rescued us therefrom." But even if their ways had been good, the human will, he goes on to say, has no data to rely upon, and he and his followers would only be guided by Allah's Will and Plan.
The answer of the righteous is threefold. (1) "Coming back is all very well. But do you mean that we should practise the vices we detest?" (2) "You want us to lie against our conscience and our Lord, after we have seen the evil of your ways." (3) "Neither bribes nor threats, nor specious appeals to patriotism or ancestral religion can move us: the matter rests with Allah, Whose will and pleasure we obey, and on Whom alone we rely. His knowledge will search out all your specious pretences."
Having answered the insincere quibblers among the godless, the righteous turn to Allah in earnest prayer. The endless controversies in this world about abstract or speculative things never end even where both sides are sincere in their beliefs. The decision must be taken to Allah, Who sits on the throne of Truth, and Whose decisions will, therefore, be free from the errors and imperfections of all human judgment. The sincere have nothing to fear in the appeal to Him, as their motives are pure.