First reading - Exodus 19:2-6a
In those days: The people of Israel came into the wilderness of Sinai, and they encamped in the wilderness. There Israel encamped before the mountain, while Moses went up to God. The LORD called to him out of the mountain, saying, ‘Thus you shall say to the house of Jacob, and tell the people of Israel: “You yourselves have seen what I did to the Egyptians, and how I bore you on eagles’ wings and brought you to myself. Now therefore, if you will indeed obey my voice and keep my covenant, you shall be my treasured possession among all peoples, for all the earth is mine; and you shall be to me a kingdom of priests and a holy nation.” ’

Responsorial Psalm
Psalm 100(99):1-2. 3. 5. ℟3c

We are his people, the sheep of his flock.

Cry out with joy to the LORD, all the earth.
Serve the LORD with gladness.
Come before him, singing for joy.

We are his people, the sheep of his flock.

Know that he, the LORD, is God.
He made us; we belong to him.
We are his people, the sheep of his flock.

We are his people, the sheep of his flock.

Indeed, how good is the LORD,
eternal his merciful love.
He is faithful from age to age.

We are his people, the sheep of his flock.

Second reading - Romans 5:6-11
‘If we were reconciled by the death of the Son, much more shall we be saved by his life.’

Brothers and Sisters: While we were still weak, at the right time Christ died for the ungodly. For one will scarcely die for a righteous person — though perhaps for a good person one would dare even to die — but God shows his love for us in that while we were still sinners, Christ died for us. Since, therefore, we have now been justified by his blood, much more shall we be saved by him from the wrath of God. For if while we were enemies we were reconciled to God by the death of his Son, much more, now that we are reconciled, shall we be saved by his life. More than that, we also rejoice in God through our Lord Jesus Christ, through whom we have now received reconciliation.

Gospel Acclamation
Mark 1:15

Alleluia, alleluia.
The kingdom of God is at hand;
repent and believe in the gospel.
Alleluia.
Gospel - Matthew 9:36-10:8
‘Jesus called to him his twelve disciples and sent them out.’

At that time: When Jesus saw the crowds, he had compassion for them, because they were harassed and helpless, like sheep without a shepherd. Then he said to his disciples, ‘The harvest is plentiful, but the labourers are few; therefore pray earnestly to the Lord of the harvest to send out labourers into his harvest.’
And he called to him his twelve disciples and gave them authority over unclean spirits, to cast them out, and to heal every disease and every affliction. The names of the twelve Apostles are these: first, Simon, who is called Peter, and Andrew his brother; James the son of Zebedee, and John his brother; Philip and Bartholomew; Thomas and Matthew the tax collector; James the son of Alphaeus, and Thaddaeus; Simon the Zealot, and Judas Iscariot, who betrayed him.
These twelve Jesus sent out, instructing them, ‘Go nowhere among the Gentiles and enter no town of the Samaritans, but go rather to the lost sheep of the house of Israel. And proclaim as you go, saying, “The kingdom of heaven is at hand.” Heal the sick, raise the dead, cleanse lepers, cast out demons. You received without paying; give without pay.’