John Gill Commentary Psalms 50:18

"When thou sawest a thief, thou consentedst with him, And hast been partaker with adulterers." — Psalms 50:18 (ASV)

When you saw a thief, then you consented with him
Or "did run with him" ^F1 ; joined and agreed with him in the commission of the same things; which was literally true of the Scribes and Pharisees: they devoured widows' houses, and robbed them of their substance, under a pretence of long prayers; they consented to the deeds of Barabbas, a robber, when they preferred him to Jesus Christ; and they joined with the thieves on the cross in reviling him: and, in a spiritual sense, they stole away the word of the Lord, every man from his neighbour; took away the key of knowledge from the people, and put false glosses upon the sacred writings;

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and have been a partaker with adulterers ;
these teachers of the law were guilty both of theft and adultery, (Romans 2:21Romans 2:22) ; they are called by our Lord an adulterous generation, (Matthew 12:39) ; and they were so in a literal sense; see (John 8:4–9) ; and in a figurative one, adulterating the word of God, and handling it deceitfully.

FOOTNOTES:

• F1: (wme Urt) (sunetrecev autw) , Sept. "currebas cum eo", V. L. sic Eth. Syr. Targum, so Vatablus, Musculus, Piscator, Ainsworth.