If thy children have sinned against him - Bildad here assumes that the children of Job had been wicked, and had been cut off in their sins. This must have cut him to the quick, for there was nothing which a bereaved father would feel more acutely than this. The meaning here is somewhat weakened by the word “if.” The Hebrew אם 'ı̂m is rather to be taken in the sense of “since” - assuming it as an indisputable point, or taking it for granted. It was not a supposition that if they should now do it, certain other consequences would follow; but the idea is, that since they had been cut off in their sins, if Job would even now seek God with a proper spirit, he might be restored to prosperity, though his beginning should be small; Job 8:7.
And he have cast them away - Bildad supposes that they had been disowned by God, and had been put to death.
For their transgression - Margin, in the hand of their. The Hebrew is, by the hand of their transgression; i. e, their sin has been the cause of it, or it has been by the instrumentality of their sin. What foundation Bildad had for this opinion, derived from the life and character of the sons of Job, we have no means of ascertaining. The probability is, however, that he had learned in general that they had been cut off; and that, on the general principle which he maintained, that God deals with men in this life according to their character, he inferred that they must have been distinguished for wickedness. Men not unfrequently argue in this way when sudden calamity comes upon others.