If thou wert pure and upright - There is something especially severe and caustic in this whole speech of Bildad. He first assumes that the children of Job were cut off for impiety, and then takes it for granted that Job himself was not a pure and upright man. This inference he seems to have derived partly from the fact that he had been visited with so heavy calamities, and partly from the sentiments which Job had himself expressed. Nothing could be more unjust and severe, however, than to take it for granted that he was a hypocrite, and then proceed to argue as if that were a settled point. He does not make it a supposition that possibly Job might have erred - which would not have been improper; but he proceeds to argue as if it were a point about which there could be no hesitation.
He would awake for thee - He would arouse or excite himself יעיר yā‛ı̂r on thy account. The image is that of arousing oneself from sleep or inactivity to aid another; and the idea is, that God had, as it were, slumbered over the calamities of Job, or had suffered them to come without interposing to prevent them, but that he would arouse himself if Job were pure, and would call upon him for aid.
And make the habitation of thy righteousness prosperous - That is, if thy habitation should become righteous now, he would make it prosperous. Hitherto, is the idea of Bildad, it has been a habitation of wickedness. Thy children have been wicked, and are now cut off. Thou thyself hast been a wicked man, and in consequence art afflicted. If now thou wouldest become pure and seek unto God, then God would make thy habitation prosperous. What could more try the patience of a sufferer than such cold and unfeeling insinuations? And what could more beautifully illustrate the nature of true courtesy, than to sit unmoved and hear such remarks? It was by forbearance in such circumstances eminently that Job showed his extraordinary patience.