1. In the year that king Uzziah died I saw also the LORD sitting upon a throne, high and lifted up, and his train filled the temple.
2. Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly.
3. And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.
4. And the posts of the door moved at the voice of him that cried, and the house was filled with smoke.
5. Then said I, Woe is me! for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts.
6. Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:
7. And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged.
8. Also I heard the voice of the Lord, saying, Whom shall I send, and who will go for us? Then said I, Here am I; send me.
9. And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not.
10. Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
11. Then said I, Lord, how long? And he answered, Until the cities be wasted without inhabitant, and the houses without man, and the land be utterly desolate,
12. And the LORD have removed men far away, and there be a great forsaking in the midst of the land.
13. But yet in it shall be a tenth, and it shall return, and shall be eaten: as a teil tree, and as an oak, whose substance is in them, when they cast their leaves: so the holy seed shall be the substance thereof.

Exodus 4:10 And Moses said unto the LORD, O my LORD, I am not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I am slow of speech, and of a slow tongue.

Exodus 6:12 And Moses spake before the LORD, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?

Exodus 6:30 And Moses said before the LORD, Behold, I am of uncircumcised lips, and how shall Pharaoh hearken unto me?

Jeremiah 1:6 Then said I, Ah, Lord GOD! behold, I cannot speak: for I am a child.

Zechariah 3:1 And he shewed me Joshua the high priest standing before the angel of the LORD, and Satan standing at his right hand to resist him.

Matthew 12:34 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

James 3:1 My brethren, be not many masters, knowing that we shall receive the greater condemnation.

James 3:2 For in many things we offend all. If any man offend not in word, the same is a perfect man, and able also to bridle the whole body.