Psalms 50:18

then thou consentedst with him The original is stronger: thou didst delight thyself with him, didst gladly associate with him. Cf. Job 34:9. R.V. omits then. The LXX vocalises the consonants differently and renders, thou didst run along with him(cp. Proverbs 1:16): but the Massoretic reading is preferable.

and hast been partaker&c. Lit., and thy portion was with adulterers:thou didst make common cause with them, condoning and sharing their sin.