Proverbs 6:24 warns against the smooth tongue of the adulteress, a direct example of the flattering mouth that works ruin.

Proverbs 7:5 similarly warns of the adulteress's smooth words, echoing the flattering mouth that leads to ruin.

Proverbs 7:21-23 shows seductive speech leading to destruction, illustrating flattery working ruin as in Proverbs 26:28.

Proverbs 29:5 states that flattering a neighbor spreads a net, directly paralleling the ruin caused by a flattering mouth.

Proverbs 6:17 lists a lying tongue as an abomination — reinforcing the condemnation of deceit and flattery here.

Luke 20:20 describes spies using pretended sincerity to entrap Jesus, exemplifying a flattering mouth that works ruin.

Luke 20:21 records the flattering address 'Teacher, we know you speak rightly' as a setup to trap Jesus—a flattering mouth.

John 8:44-49 identifies the devil as the father of lies, connecting the lying tongue to a spiritual origin of deception.

Judges 16:6 shows Delilah's deceptive questioning of Samson, a lying tongue that hates and destroys its target.

1 Samuel 24:9 refers to men slandering David with lies, demonstrating a lying tongue that hates and hurts.

Psalm 55:21 describes a flattering mouth hiding violent intent — a direct parallel to the lying tongue and flattering mouth that cause harm.

1 Thessalonians 2:5 states Paul never used flattery as a pretext — directly echoing the warning against a flattering mouth.

Daniel 11:32 describes flattery corrupting covenant-breakers — showing the destructive power of flattery as warned in the proverb.

In 2 Chronicles 24:17, officials flatter the king after Jehoiada's death, leading to ruin — exemplifying the flattering mouth that works ruin.

Ezekiel 12:24 promises an end to flattering divination — false prophecy that deceives, akin to the flattering mouth that ruins.