A hymn for Pentecost here
Heavenly King, Comforter, Spirit of Truth, everywhere present and filling all things, Treasury of Blessings and giver of life, come and dwell within us, cleanse us of all stain, and save our souls O Gracious One.
Today is the official end of Easter, today we celebrate the descent of the Holy Spirit on the Apostles and Mary. The Apostles' were unable to bring the message of Jesus Christ to the ends of the earth, without the power from on high.
Today our colour is green for Hope (the only day in the Byzantine church we wear green), in our new life in the Spirit. (In Rome it is red for the Holy Spirit)
Let us pray to cooperate with the grace we receive.