The Roman Catholic Church, according to the General Roman Calendar, celebrates the following in Thursday, 2018-12-06:
Isaiah 6:1-8
1In the year that King Uzzi'ah died I saw the Lord sitting upon a throne, high and lifted up;and his train 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 flew one of the seraphim to me, having in his hand a burning coal which 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 forgiven." 8And 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."
Psalms 40:2, 4, 7-11
1I waited patiently for the LORD;he inclined to me and heard my cry. 3He put a new song in my mouth, a song of praise to our God. Many will see and fear, and put their trust in the LORD. 6Sacrifice and offering thou dost not desire;but thou hast given me an open ear. Burnt offering and sin offering thou hast not required. 7Then I said, "Lo, I come;in the roll of the book it is written of me;8I delight to do thy will, O my God;thy law is within my heart." 9I have told the glad news of deliverance in the great congregation;lo, I have not restrained my lips, as thou knowest, O LORD. 10I have not hid thy saving help within my heart, I have spoken of thy faithfulness and thy salvation;I have not concealed thy steadfast love and thy faithfulness from the great congregation.
Luke 10:1-9
1After this the Lord appointed seventy others, and sent them on ahead of him, two by two, into every town and place where he himself was about to come. 2And he said to them, "The harvest is plentiful, but the laborers are few;pray therefore the Lord of the harvest to send out laborers into his harvest. 3Go your way;behold, I send you out as lambs in the midst of wolves. 4Carry no purse, no bag, no sandals;and salute no one on the road. 5Whatever house you enter, first say, `Peace be to this house!' 6And if a son of peace is there, your peace shall rest upon him;but if not, it shall return to you. 7And remain in the same house, eating and drinking what they provide, for the laborer deserves his wages;do not go from house to house. 8Whenever you enter a town and they receive you, eat what is set before you;9heal the sick in it and say to them, `The kingdom of God has come near to you.'
Is 26:1-6
Ps 118:1 and 8-9, 19-21, 25-27a
Mt 7:21, 24-27