We read from the beginning of the gospel of Mark: Mark: 1:1-8 Here begins the gospel of Jesus Christ, the Son of God. In Isaiah the prophet , it is written: "I send my messenger before you to prepare your way: a herald's voice in the desert, crying, "Make ready the way of the Lord, clear his a straight path." Thus it was that John the Baptizer appeared in the desert proclaiming a baptism of repentance which led to the forgiveness of sins. All the Judean countryside and the people of Jerusalem went out to him in great numbers. They were being baptized by him in the Jordan River as they confessed their sins. John was clothed in camel's hair, and wore a leather belt around his waist. His food was grasshoppers and wild honey. The theme of his preaching was: "one more powerful than I is to come after me. I am not fit to stoop and untie his sandal straps. I have baptized you in water; he will baptize you in the Holy Spirit."
Ps. 85 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. Lord, let us see your kindness, and grant us your salvation." Source: Second Week of Advent