Psalm 10:7 is the source quoted here, describing the wicked's mouth full of cursing, deceit, and oppression.

Psalm 59:12 also describes the wicked using their mouths for cursing and lies, showing this pattern of sinful speech condemned throughout Scripture.

Psalm 109:17 portrays one who loved to curse — the same heart attitude behind the cursing described here.

Psalm 109:18 intensifies the image: cursing became like a garment and entered the body, showing how deeply embedded it is.

Psalm 50:19 accuses the wicked of using their mouth for evil and deceit, directly paralleling the cursing and bitterness here.

Psalm 140:3, quoted in Romans 3:13 just before this verse, describes poisonous speech — the same OT source Paul is drawing on.

Luke 6:45 explains that the mouth speaks from the heart's overflow — this verse's cursing reveals a heart full of bitterness.

Ephesians 4:29 commands wholesome speech instead of corrupt talk — a direct contrast to the cursing and bitterness here.

Ephesians 4:31 commands putting away bitterness — the very sin that fills the mouth here.

James 3:6 portrays the tongue as a fire of unrighteousness — illustrating the destructive speech described here.

James 3:9 condemns cursing people made in God's image — the same sin of cursing and bitterness here.

James 3:10 highlights the inconsistency of blessing and cursing from the same mouth — this verse lists the cursing side of that problem.

Matthew 15:11 teaches that what comes out of the mouth defiles a person — this verse gives a concrete example of such defiling speech.