Let me be weighed in an even balance - Margin, him weigh me in balances of justice. That is, let him ascertain exactly my character, and treat me accordingly. If on trial it be found that I am guilty in this respect, I consent to be punished accordingly. Scales or balances are often used as emblematic of justice. Many suppose, however, that this verse is a parenthesis, and that the imprecation in Job 31:8, relates to Job 31:5, as well as to Job 31:7. But most probably the meaning is, that he consented to have his life tried in this respect in the most exact and rigid manner, and was willing to abide the result. A man may express such a consciousness of integrity in his dealings with others, without any improper self-reliance or boasting. It may be a simple fact of which he may be certain, that he has never meant to defraud any man.

Mine integrity - תמתי tummathi, my perfection; the totality of my unblameable life.

Let me be weighed in an even balance, that God may know mine (d) integrity.
(d) He shows what his uprightness stands in, in as much as he was blameless before men and did not sin against the second table.

Let me be weighed in an even balance,.... Or "in balances of righteousness" (z), even in the balance or strict justice, the justice of God; he was so conscious to himself that he had done no injustice to any man in his dealings with them, that, if weight of righteousness, which was to be, and was the rule of his conduct between man and man, was put into one scale, and his actions into another, the balance would be even, there would be nothing wanting, or, however, that would require any severe censure:
that God may know mine integrity; God did knew his integrity, and bore a testimony to it, and to his retaining it, Job 2:3; but his meaning is, that should God strictly inquire into his life and conduct with respect to his dealings with men, as it would appear that he had lived in all good conscience to that day, so he doubted not but he would find his integrity such, that he would own and acknowledge it, approve of it, and commend it, and make it known to his friends and others, whereby he would be cleared of all those calumnies that were cast upon him. Some connect these words with the following, reading them affirmatively, "God knows mine integrity"; he knows that my step has not turned out of the way of truth and righteousness; that my heart has not walked after mine eye, in lustful thoughts and desires; and that there is no spoil, nor rapine, nor violence in my hand, that I should deserve such a punishment as to sow, and another eat: thus Sephorno.
(z) "in bilancibus justitiae", Montanus, Mercerus, Drusius, so Junius & Tremellius, Cocceius, Michaelis, Schultens.

Parenthetical. Translate: "Oh, that God would weigh me . . . then would He know," &c.

Let me - I desire nothing more than to have my heart and life weighed in just balances, and searched out by the all - seeing God. That God - Or, and he will know; (upon search he will find out: which is spoken of God after the manner of men:) Mine integrity - So this is an appeal to God to be witness of his sincerity.