Watch what you say

“Let no unwholesome word proceed from your mouth, but only such a word as is good for edification according to the need of the moment, that it may give grace to those who hear. Let no corrupt word proceed out of your mouth, but that which is good for edification, that it may minister grace unto the hearers.” (Eph. 4:29)

Keep your lips from speaking evil

“For “Whoever desires to love life and see good days, let him keep his tongue from evil and his lips from speaking deceit.” (1 Peter 3:10 ESV)

“So also the tongue is a small member, yet it boasts of great things. How great a forest is set ablaze by such a small fire!” (James 3:5 ESV)

Bridle your tongue

“If anyone thinks he is religious and does not bridle his tongue but deceives his heart, this person's religion is worthless.” (James 1:26 ESV)

Therefore…

“Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person.” (Col. 4:6 ESV)

“Set a guard, O Lord, over my mouth; keep watch over the door of my lips!” (Psalm 141:3 ESV)

“Let the words of my mouth and the meditation of my heart be acceptable in your sight, O Lord, my rock and my redeemer.” (Psalm 19:14 ESV)