Luke 6:45
A good man out of the good treasure of his heart brings forth that which is good; and an evil man out of the evil treasure of his heart brings forth that which is evil: for of the abundance of the heart his mouth speaks.
Psalm 37:30-31
The mouth of the righteous speaks wisdom, and his tongue talks of justice.
Proverbs 4:23
Keep your heart with all diligence; for out of it are the issues of life.
Matthew 12:34-37
O generation of vipers, how can you, being evil, speak good things? for out of the abundance of the heart the mouth speaks.
Acts 8:19-23
Saying, Give me also this power, that on whomsoever I lay hands, he may receive the Holy Spirit.
Romans 3:13-14
Their throat is an open sepulcher; with their tongues they have used deceit; the poison of asps is under their lips:
Ephesians 4:29
Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Ephesians 5:3-4
But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becomes saints;
Ephesians 5:19
Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord;
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every man.
Hebrews 8:10
For this is the covenant that I will make with the house of Israel after those days, says the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
James 3:5-8
Even so the tongue is a little member, and boasts great things. Behold, how great a forest a little fire kindles!
Psalm 12:2-4
They speak vanity every one with his neighbor: with flattering lips and with a double heart do they speak.
Psalm 40:8-10
I delight to do your will, O my God: yea, your law is within my heart.
Psalm 41:6-7
And if he comes to see me, he speaks vanity: his heart gathers iniquity to itself; when he goes abroad, he tells it.
Psalm 52:2-4
Your tongue devises evil; like a sharp razor, working deceitfully.
Psalm 59:7
Behold, they bellow out with their mouths: swords are in their lips: for who, say they, does hear?
Psalm 59:12
For the sin of their mouth and the words of their lips let them even be taken in their pride: and for the cursing and lying which they speak.
Psalm 64:3-8
Who whet their tongue like a sword, and bend their bows to shoot their arrows, even bitter words:
Psalm 71:15-18
My mouth shall show forth your righteousness and your salvation all the day; for I know not the limits thereof.
Psalm 140:5
The proud have hid a snare for me, and cords; they have spread a net by the wayside; they have set traps for me. Selah.
Proverbs 10:20-21
The tongue of the just is as choice silver: the heart of the wicked is of little worth.
Proverbs 12:18
There is one that speaks like the piercings of a sword: but the tongue of the wise brings health.
Proverbs 15:23
A man has joy by the answer of his mouth: and a word spoken in due season, how good is it!
Proverbs 22:17-18
Bow down your ear, and hear the words of the wise, and apply your heart unto my knowledge.
Jeremiah 9:2-5
Oh that I had in the wilderness a lodging place for wayfaring men; that I might leave my people and go from them! For they are all adulterers, an assembly of treacherous men.
John 7:38
He that believes on me, as the scripture has said, out of his heart shall flow rivers of living water.
Acts 5:3
But Peter said, Ananias, why has Satan filled your heart to lie to the Holy Spirit, and to keep back part of the price of the land?
2 Corinthians 4:6-7
For God, who commanded the light to shine out of darkness, has shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ.
Ephesians 3:8
Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
Colossians 3:16
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
Jude 1:15
To execute judgment upon all, and to convict all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against him.