tongue

Proverbs 12:18
Speaking rashly is like a piercing sword, but the tongue of the wise brings healing.

Proverbs 15:4
A soothing tongue is a tree of life, but a perverse tongue crushes the spirit.

Proverbs 16:13
Righteous lips are a king's delight, and he who speaks honestly is beloved.

Proverbs 25:11, 12
A word fitly spoken is like apples of gold in settings of silver. . . .

Matthew 12:35
The good man brings good things out of his good store of treasure, and the evil man brings evil things out of his evil store of treasure.

the heart

Proverbs 23:7
for he is keeping track, inwardly counting the cost. "Eat and drink, " he says to you, but his heart is not with you.

Genesis 6:5
Then the LORD saw that the wickedness of man was great upon the earth, and that every inclination of the thoughts of his heart was altogether evil all the time.

Genesis 8:21
When the LORD smelled the pleasing aroma, He said in His heart, "Never again will I curse the ground because of man, even though every inclination of his heart is evil from his youth. And never again will I destroy all living creatures as I have done.

Jeremiah 17:9
The heart is deceitful above all things and beyond cure--who can understand it?

Matthew 12:34
You brood of vipers, how can you who are evil say anything good? For out of the overflow of the heart, the mouth speaks.