"The voice of the Lord upon the waters..."

Christ's Baptism in the River Jordan, or the Feast of Holy Theophany (source)

  
The voice of the Lord upon the waters cries out, saying, ‘Come all of you, receive the Spirit of wisdom, the Spirit of understanding, the Spirit of the fear of God, of Christ who has appeared’.
-Idiomelon from the Great Blessing of the Waters on the feast of Holy Theophany
  
(source)
  

Through the prayers of our Holy Fathers, Lord Jesus Christ, have mercy on us and save us! Amen!