Today the Church commemorates an important event in the earthly life of our Lord Jesus Christ (Luke 2:22-40). Forty days after His birth the God-Infant was taken to the Jerusalem Temple, the center of the nation’s religious life. According to the Law of Moses (Lev. 12:2-8), a woman who gave birth to a male child was forbidden to enter the Temple of God for forty days. At the end of this time the mother came to the Temple with the child, to offer a young lamb or pigeon to the Lord as a purification sacrifice. The Most Holy Virgin, the Mother of God, had no need of purification, since she had given birth to the Source of purity and sanctity without defilement. However, she humbly fulfilled the requirements of the Law.
https://www.oca.org/saints/lives/2020/02/02/100407-the-meeting-of-our-lord-and-savior-jesus-christ-in-the-temple