On this day, in the Orthodox Church, we celebrate the feast day of the Entry into the Temple of the Most-holy Virgin Mary.
When Mary was about three years of age, her parents fulfilled their promise to consecrate their child to the service of God. Dressing her in fine clothes and accompanied by family and friends, Joachim and Anna took Mary to the Temple in Jerusalem. They set Mary upon the staircase. After climbing to the top, the chief priest met and blessed her in just the way he did with all who came to be consecrated to God. But then, at the inspiration of the Holy Spirit, he led her into the Holy of Holies- the most sacred place in the Temple. NO ONE ever entered there except the priest who, himself, only entered there once a year. The Holy Spirit made the priest aware was worthy to do this. She was destined by God to become the Mother of the Son of God.
Having fulfilled their promise, Joachim and Anna returned home while Mary stayed behind, now living at the Temple. There she, along with other girls, studied the Law of God, prayed, read Holy Scriptures, and followed the fasts. It is said that she lived there eleven years, growing in her devotion and submissiveness to God.
This Feast Day, commemorating this event, is celebrated on the 21st of November each year.
Troparion of the Feast
Today is the preview of the good will of God,Of the preaching of the salvation of mankind.The Virgin appears in the temple of God,In anticipation proclaiming Christ to all.Let us rejoice and sing to her: Rejoice,0 Divine Fulfillment of the Creator's dispensation.
References: The Law of God For Study at Home and School