I got this from a bookmark:

Lord, put a watch on my lips, put a guard on what I say;
For Lord I want to live for you and bless someone today.
For every idle word I speak when in gossip I take part,
Reveals the kind of man inside, hidden deep within my heart.
There's power in my lips today to heal a heart or break it;
May my tongue with every word it speaks,
Please the one who made it.

"Keep thy tongue from evil, and thy lips from speaking guile.
Depart from evil, and do good; seek peace, and pursue it"
Psalms 34:13-14