Today is Baptism of the Lord and the liturgical end of the Christmas season (not sure that applies to the Eastern Rites).
Luke 3:15-17, 21-22
3:15 As the people were filled with expectation, and all were questioning in their hearts concerning John, whether he might be the Messiah,
3:16 John answered all of them by saying, "I baptize you with water; but one who is more powerful than I is coming; I am not worthy to untie the thong of his sandals. He will baptize you with the Holy Spirit and fire.
3:17 His winnowing fork is in his hand, to clear his threshing floor and to gather the wheat into his granary; but the chaff he will burn with unquenchable fire."
3:21 Now when all the people were baptized, and when Jesus also had been baptized and was praying, the heaven was opened,
3:22 and the Holy Spirit descended upon him in bodily form like a dove. And a voice came from heaven, "You are my Son, the Beloved; with you I am well pleased."