The Bible has numerous warnings that careless words have eternal consequences. It is time for all of us to curb our tongues both for the good of society but more importantly for the good of our souls. To understand the seriousness of inappropriate speech you need only consult Revelations 21:8. All liars are in the category with the cowardly, the unbelievers, the abominable, murderers, whore-mongers, sorcerers and idolaters; they will be cast into a pool of fire and brimstone. A clear warning if there ever was one.
Just in case you are interested here are other Biblical references for consideration.
James 1:19 James 3:2-18 Matthew 12:36-37 1Timothy 5:1-2 2Timothy 4:2
Ecclesiastes 5:1-6 Isaiah 56:10 Leviticus 19:16 Proverbs 10:19 Proverbs 10:32
Proverbs 11:12-13 Proverbs 12:18 Proverbs 12:22-23 Proverbs 13:3 Proverbs 15:2
Proverbs 15:4 Proverbs 17:27-28 Proverbs 18:2 Proverbs 18:6 Proverbs 19:5
Proverbs 19:9 Proverbs 20:19 Proverbs 21:23 Proverbs 22:10 Proverbs25:23
Proverbs 27:6 Proverbs 28:23 Psalm 12:4-5 Psalm 34:13 Psalm 109:17
Psalm 141:3 Sirach 5:13-16 Sirach 19:5-14 Sirach 20:8 Sirach 28:25-26