Psalm 7:16 says mischief returns on the wicked's own head — the same retributive justice prayed for in Psalm 140:9.

Psalm 64:8 says the wicked's own tongue falls on them — directly parallel to asking that their own lips cover them with mischief.

Psalm 94:23 says God brings their own iniquity on them — identical concept of self-inflicted judgment as in Psalm 140:9.

Psalm 141:10 asks that the wicked fall into their own nets, mirroring the idea that their own lips cause their downfall.

In Psalm 5:10, the psalmist prays for enemies to fall by their own counsels — a parallel imprecation to this verse.

In Psalm 7:15, the wicked fall into the pit they dug — the same principle of self-inflicted ruin as in this verse.

In Psalm 9:16, the wicked are snared by their own work — a direct parallel to the request here for lips' mischief to cover them.

Psalm 59:12 directly prays for the wicked to be trapped by their own words, exactly paralleling the 'mischief of their lips' covering them.

In Psalm 31:18, the psalmist asks for lying lips to be silenced — a similar imprecation against malicious speech.

Psalm 109:29 asks that accusers be clothed with dishonor, similar to being covered by their own lips' mischief—both images of poetic justice.

Esther 7:10 shows Haman hanged on his own gallows — a precise fulfillment of the prayer that enemies' own mischief covers them.

Proverbs 12:13 agrees that the wicked are ensnared by their own lips, just as the psalmist prays.

In Esther 9:25, Haman's plot explicitly returns on his own head — directly matching the prayer here.

Ecclesiastes 10:12 says the lips of a fool consume him, directly analogous to the mischief of their lips covering them in Psalm 140:9.

Proverbs 10:6 says violence covers the mouth of the wicked — similar imagery of the wicked being covered by their own evil.

Proverbs 10:11 repeats that violence covers the mouth of the wicked — same proverbial parallel to the retribution concept.

In 1 Kings 2:23, Solomon's oath invokes the same logic — that an enemy's words bring judgment on himself.

In Proverbs 18:7, a fool's own lips destroy him — the same principle that the psalmist invokes for his enemies' mischief to cover them.