"The waters saw You, O God..."

The Baptism of Christ, Holy Theophany (source)

  
The waters saw You, O God, the waters saw You and were afraid. For towards Your glory the eyes of the Cherubim are not able to gaze, nor are the Seraphim able to approach You. But they stand around You in fear, the former bearing You up, and the latter glorifying Your power. Together with them, O Compassionate One, we tell of Your praise, saying: "O God Who has appeared, have mercy on us."
-Idiomelon from the Aposticha for the Holy Feast of Theophany
  
(source)
  

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