Isaiah 6:7

וָאֹמַר אֽוֹי־לִי כִֽי־נִדְמֵיתִי כִּי אִישׁ טְמֵֽא־שְׂפָתַיִם אָנֹכִי וּבְתוֹךְ עַם־טְמֵא שְׂפָתַיִם אָנֹכִי יוֹשֵׁב כִּי אֶת־הַמֶּלֶךְ יְהוָה צְבָאוֹת רָאוּ עֵינָֽי

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.

וַיָּעָף אֵלַי אֶחָד מִן־הַשְּׂרָפִים וּבְיָדוֹ רִצְפָּה בְּמֶלְקַחַיִם לָקַח מֵעַל הַמִּזְבֵּֽחַ

Then flew unto me one of the seraphim, with a glowing stone in his hand, which he had taken with the tongs from off the altar;

וָאֶשְׁמַע אֶת־קוֹל אֲדֹנָי אֹמֵר אֶת־מִי אֶשְׁלַח וּמִי יֵֽלֶךְ־לָנוּ וָאֹמַר הִנְנִי שְׁלָחֵֽנִי

And I heard the voice of the Lord, saying: Whom shall I send, And who will go for us? Then I said: ‘Here am I; send me.’

וַיֹּאמֶר לֵךְ וְאָמַרְתָּ לָעָם הַזֶּה שִׁמְעוּ שָׁמוֹעַ וְאַל־תָּבִינוּ וּרְאוּ רָאוֹ וְאַל־תֵּדָֽעוּ

And He said: ‘Go, and tell this people: Hear ye indeed, but understand not; and see ye indeed, but perceive not.