Proverbs 1:10-19 warns against joining thieves — directly relevant to being pleased with a thief here.

Hebrews 13:4 affirms God will judge adulterers — reinforcing why joining with them is so serious in the Psalm.

1 Timothy 5:22 echoes the same warning: do not share in others' sins, reinforcing the call to avoid complicity with wrongdoers.

Ephesians 5:11-13 contrasts: instead of joining with darkness, believers must expose it — the opposite of throwing in your lot with sinners.

Matthew 23:30 exposes the Pharisees' hypocrisy: they claim they wouldn't join in killing prophets, yet they do — mirroring the Psalm's charge of joining with sinners.

Romans 1:32 echoes this: not only do sinners do evil, they also approve of those who practice it — the same 'joining with' condemned here.

Revelation 18:4 calls God's people to come out of Babylon to avoid sharing her sins, paralleling the warning against joining with sinners.

2 John 1:11 states that welcoming false teachers shares in their wicked work, applying the same principle of complicity by association.

Ephesians 5:7 directly commands not to be partners with the disobedient, echoing the warning against joining with sinners here.

1 Corinthians 6:10 lists thieves and adulterers among those excluded from God's kingdom, reinforcing the seriousness of joining with them.

Obadiah 1:11 condemns standing aloof and being 'like one of them' — a strong parallel to throwing in one's lot with sinners.

Proverbs 29:24 speaks of being a partner of a thief, mirroring the Psalm's 'you join with him' — a direct parallel on complicity.

Job 34:8 directly parallels the theme: 'who goes in company with evildoers' — exactly the complicity condemned in Psalm 50:18.

Acts 5:9 highlights Sapphira's agreement with her husband to sin — a partnership in wrongdoing, similar to joining with thieves or adulterers.

Jeremiah 5:9 declares God will punish such adultery — adding divine judgment to the Psalm's condemnation of joining with adulterers.

Jeremiah 5:8 describes Israel's lust for adultery — the same sin that the Psalmist says you join with when you associate with adulterers.

James 4:4 warns that friendship with the world is enmity against God, expanding the concept of joining with adulterers to spiritual unfaithfulness.

Leviticus 20:10 prescribes death for adultery itself — the very sin whose practitioners the Psalm condemns joining.