Proverbs 10:19 warns that many words lead to sin — reinforcing the value of guarding one's tongue described here.

In Proverbs 12:13, the same truth appears: the wicked are snared by their lips, but the righteous escape trouble—reinforcing the consequence of guarding speech.

In Proverbs 13:3, guarding the mouth preserves life—nearly identical to 21:23, emphasizing self-control's benefit.

In Proverbs 18:21, the tongue holds life and death—reveals why guarding it prevents the troubles mentioned in 21:23.

In Proverbs 10:14, wise store knowledge while fools' mouths bring ruin—contrasts outcomes of speech, reinforcing the need to guard it.

In Proverbs 17:27, restraining words shows knowledge—adds that a guarded tongue reflects wisdom and understanding.

In Proverbs 17:28, even a fool gains credit by silence—expands on how guarding speech leads to perceived wisdom.

In James 1:26, an unbridled tongue makes religion worthless—NT intensifies the spiritual stakes of guarding the mouth.

In James 3:2-13, the tongue's power and difficulty to tame are elaborated—deepens the warning of 21:23 with practical examples.

In Psalm 39:1, David resolves to guard his tongue from sin—a personal commitment that echoes the proverb's counsel.

James 1:19 echoes this wisdom — being slow to speak is a practical guard against trouble.