When you saw a thief, then you consented with him, and have been partaker with adulterers.
All Commentaries on Psalms 50:18 Go To Psalms 50
Augustine of Hippo
AD 430
25. "If thou sawest a thief, thou didst consent unto him, and with adulterers thou didst make thy portion" (ver. 18). Lest perchance thou shouldest say, I have not committed theft, I have not committed adultery. What if he pleased thee that hath committed? Hast thou not with the very pleasing consented? Hast thou not by approval made thy portion with him that hath committed? For this is , brethren, to consent with a thief, and to make with an adulterer thy portion: for even if thou committest not, and approvest what iscommitted, thou art an accessory in the deed: for "the sinner ispraised in the longings of his soul, and hethat doeth iniquity shall be blessed." Thou doest not evil things, thou praisest evil-doers. For isthis a small evil? "Thou didst make thy portion with adulterers."