Matt 12:35-37 (MSG)

A good person produces good deeds and words season after season. An evil person is a blight on the orchard. 

36 Let me tell you something: Every one of these careless words is going to come back to haunt you. There will be a time of Reckoning. Words are powerful; take them seriously. 

37 Words can be your salvation. Words can also be your damnation.