Ecclesiastes 5:2
Be not rash with thy mouth, and let not thine heart be hasty to utter anything before God.
I saw a cartoon once of ex-President Nixon with his mouth open and footprints across his tongue! Consider before you speak. Think about what you will say before you say it. Talk is cheap. But the after-effects can be VERY costly. Another aspect of the verse is - don’t make promises or commitments (vows, if you will) that you can’t keep or wish very much that you’d never made.