C. F. Keil and Franz Delitzsch on Proverbs 29:24

Pro 29:24 24 He that taketh part with a thief hateth himself;      He heareth the oath and confesseth not.

Hitzig renders the first member as the pred. of the second: “he who does not bring to light such sins as require an atonement (Lev 5:1.), but shares the secret of them with the sinner, is not better than one who is a partner with a thief, who hateth himself.” The construction of the verse, he remarks, is not understood by any interpreter. It is not, however, so cross, - for, understood as Hitzig thinks it ought to be, the author should have expressed the subject by שׁמע אלה ולא יגיד, - but is simple as the order of the words and the verbal form require it. The oath is, after Lev 5:1, that of the judge who adjures the partner of the thief by God to tell the truth; but he conceals it, and burdens his soul with a crime worthy of death, for from a concealer he becomes in addition a perjured man.