Isaiah 6

¹In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. ²Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. ³And one called to another and said:
“Holy, holy, holy is the Lord of hosts;
the whole earth is full of his glory!”
⁴And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. ⁵And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the Lord of hosts!”
⁶Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. ⁷And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.”

⁸And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am! Send me.” ⁹And he said, “Go, and say to this people:
“‘Keep on hearing, but do not understand;
keep on seeing, but do not perceive.’

¹⁰ Make the heart of this people dull,
and their ears heavy,
and blind their eyes;
lest they see with their eyes,
and hear with their ears,
and understand with their hearts,
and turn and be healed.”

¹¹Then I said, “How long, O Lord?”
And he said:
“Until cities lie waste
without inhabitant,
and houses without people,
and the land is a desolate waste,

¹²and the Lord removes people far away,
and the forsaken places are many in the midst of the land.

¹³ And though a tenth remain in it,
it will be burned again,
like a terebinth or an oak,
whose stump remains
when it is felled.”
The holy seed is its stump.

source