The feast of the Dormition or Falling-asleep of the Theotokos is celebrated on the fifteenth of August, preceded by a two-week fast. This feast, which is also sometimes called the Assumption, commemorates the death, resurrection and glorification of Christ’s mother. It proclaims that Mary has been “assumed” by God into the heavenly kingdom of Christ in the fullness of her spiritual and bodily existence.
As with the nativity of the Virgin and the feast of her entrance to the temple, there are no biblical or historical sources for this feast. The Tradition of the Church is that Mary died as all people die, not “voluntarily” as her Son, but by the necessity of her mortal human nature which is indivisibly bound up with the corruption of this world.
The Orthodox Church teaches that Mary is without personal sins. In the Gospel of the feast, however, in the liturgical services and in the Dormition icon, the Church proclaims as well that Mary truly needed to be saved by Christ as all human persons are saved from the trials, sufferings and death of this world; and that having truly died, she was raised up by her Son as the Mother of Life and participates already in the eternal life of paradise which is prepared and promised to all who “hear the word of God and keep it” (Lk11.27–28).
In giving birth, you preserved your virginity. In falling asleep you did not forsake the world, O Theotokos. You were translated to life, O Mother of Life, and by your prayers, you deliver our souls from death (Troparion).
Neither the tomb, nor death, could hold the Theotokos, who is constant in prayer and our firm hope in her intercessions. For being the Mother of Life, she was translated to life, by the One who dwelt in her virginal womb (Kontakion).