Set a guard over my mouth, LORD; keep watch over the door of my lips. Psalm 141:3

Keep your tongue from evil and your lips from telling lies. Psalm 34:13

I said, "I will watch my ways and keep my tongue from sin; I will put a muzzle on my mouth while in the presence of the wicked." Psalm 39:1

Those who guard their lips preserve their lives, but those who speak rashly will come to ruin. Proverbs 13:3

Those who guard their mouths and their tongues keep themselves from calamity. Psalm 21:23