The Roman Catholic Church, according to the General Roman Calendar, celebrates the following in Sunday, 2020-12-06:
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 40:1-5, 9-11
Comfort, give comfort to my people,
says your God.
Speak tenderly to Jerusalem, and proclaim to her
that her service is at an end,
her guilt is expiated;
indeed, she has received from the hand of the LORD
double for all her sins.
A voice cries out:
In the desert prepare the way of the LORD!
Make straight in the wasteland a highway for our God!
Every valley shall be filled in,
every mountain and hill shall be made low;
the rugged land shall be made a plain,
the rough country, a broad valley.
Then the glory of the LORD shall be revealed,
and all people shall see it together;
for the mouth of the LORD has spoken.
Go up on to a high mountain,
Zion, herald of glad tidings;
cry out at the top of your voice,
Jerusalem, herald of good news!
Fear not to cry out
and say to the cities of Judah:
Here is your God!
Here comes with power
the Lord GOD,
who rules by his strong arm;
here is his reward with him,
his recompense before him.
Like a shepherd he feeds his flock;
in his arms he gathers the lambs,
carrying them in his bosom,
and leading the ewes with care.
ps 85:9-10, 11-12, 13-14
R/ (8)
Lord, let us see your kindness, and grant us your salvation.
I will hear what God proclaims;
the LORD—for he proclaims peace to his people.
Near indeed is his salvation to those who fear him,
glory dwelling in our land.
R/
Lord, let us see your kindness, and grant us your salvation.
Kindness and truth shall meet;
justice and peace shall kiss.
Truth shall spring out of the earth,
and justice shall look down from heaven.
R/
Lord, let us see your kindness, and grant us your salvation.
The LORD himself will give his benefits;
our land shall yield its increase.
Justice shall walk before him,
and prepare the way of his steps.
R/
Lord, let us see your kindness, and grant us your salvation.
2 pt 3:8-14
Do not ignore this one fact, beloved,
that with the Lord one day is like a thousand years
and a thousand years like one day.
The Lord does not delay his promise, as some regard "delay,"
but he is patient with you,
not wishing that any should perish
but that all should come to repentance.
But the day of the Lord will come like a thief,
and then the heavens will pass away with a mighty roar
and the elements will be dissolved by fire,
and the earth and everything done on it will be found out.
Since everything is to be dissolved in this way,
what sort of persons ought you to be,
conducting yourselves in holiness and devotion,
waiting for and hastening the coming of the day of God,
because of which the heavens will be dissolved in flames
and the elements melted by fire.
But according to his promise
we await new heavens and a new earth
in which righteousness dwells.
Therefore, beloved, since you await these things,
be eager to be found without spot or blemish before him, at peace.
Lk 3:4, 6
R.Alleluia, alleluia.
Prepare the way of the Lord, make straight his paths:
all flesh shall see the salvation of God.
R.Alleluia, alleluia.
mk 1:1-8
The beginning of the gospel of Jesus Christ the Son of God.
As it is written in Isaiah the prophet:
Behold, I am sending my messenger ahead of you;he will prepare your way. A voice of one crying out in the desert: "Prepare the way of the Lord, make straight his paths."
John the Baptist appeared in the desert
proclaiming a baptism of repentance for the forgiveness of sins.
People of the whole Judean countryside
and all the inhabitants of Jerusalem
were going out to him
and were being baptized by him in the Jordan River
as they acknowledged their sins.
John was clothed in camel’s hair,
with a leather belt around his waist.
He fed on locusts and wild honey.
And this is what he proclaimed:
"One mightier than I is coming after me.
I am not worthy to stoop and loosen the thongs of his sandals.
I have baptized you with water;
he will baptize you with the Holy Spirit."