"The Ancient of Days, Who formerly granted the Law to Moses on Mount Sinai..."

Detail from the icon of the Presentation of Christ to the Temple (source)

  
The Ancient of Days, Who formerly granted the Law to Moses on Mount Sinai, today is seen as an infant, and according to the Law, as the Creator of the Law fulfills the Law, being brought into the Temple and is given to the Priest. The Righteous Symeon receiving Him, and beholding the dissolving of bonds being performed, cries out joyfully: My eyes have seen the Mystery hidden from before the ages, but which has been revealed to us in these latter days, the Light that disperses the darkness of the faithless nations, and the glory of the new Israel. Therefore, let your servant depart from the bonds of this flesh towards the heavenly and wondrous eternal life, You Who grant the world the great mercy.
-Idiomelon from the Litia of Vespers for the Feast of the Presentation of Christ to the Temple
  
(source)
  

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