Let no unwholesome word come out of your mouth, but if there is any good word for edification according to the need of the moment, say that, so that it will give grace to those who hear. (Ephesians 4:29 NASB)
Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person. (Colossians 4:6 ESV)
LORD, set up a guard for my mouth; keep watch at the door of my lips. (Psalm 141:3 CSB)
Now if we put bits into the mouths of horses so that they obey us, we direct their whole bodies. And consider ships: Though very large and driven by fierce winds, they are guided by a very small rudder wherever the will of the pilot directs. So too, though the tongue is a small part of the body, it boasts great things. Consider how a small fire sets ablaze a large forest. And the tongue is a fire. The tongue, a world of unrighteousness, is placed among our members. It stains the whole body, sets the course of life on fire, and is itself set on fire by hell. Every kind of animal, bird, reptile, and fish is tamed and has been tamed by humankind, but no one can tame the tongue. It is a restless evil, full of deadly poison. (James 3:3-8 CSV)