Return, I pray you - That is, return to the argument. Give your attention to it again. Perhaps he may have discerned a disposition in them to turn away from what he was saying, and to withdraw and leave him. Job expresses his belief that he could convince them; and he proposes more fully to state his views, if they would attend to him.
Let it not be iniquity - Let it not be considered as wrong thus to come back to the argument. Or, let it not be assumed that my sentiments are erroneous, and my heart evil. Job means, that it should not be taken for granted that he was a hypocrite; that he was conscious of sincerity, and that he was convinced that he could satisfy them of it if they would lend a listening ear. A similar sentiment he expresses in Job 19:28 :
But ye should say, Why persecute we him?
Seeing the root of the matter is found in me.
My righteousness is in it - Margin, that is, this matter. The sense is, “my complete vindication is in the argument which I propose to state. I am prepared to show that I am innocent.” On that account, he wishes them to return and attend to what he proposed to say.