J.M.J. From The Catholic Encyclopedia (1913) found on "New Advent (www.newadvent.org):
"According to the Mosaic law a mother who had given birth to a man-child was considered unclean for seven days; moreover she was to remain three and thirty days 'in the blood of her purification'; for a maid-child the time which excluded the mother from sanctuary was even doubled. When the time (forty or eighty days) was over the mother was to 'bring to the temple a lamb for a holocaust and a young pigeon or turtle dove for sin'; if she was not able to offer a lamb, she was to take two turtle doves or two pigeons; the priest prayed for her and so she was cleansed. (Leviticus 12:2-8)
"Forty days after the birth of Christ Mary complied with this precept of the law, she redeemed her first-born from the temple (Numbers 18:15), and was purified by the prayer of Simeon the just, in the presence of Anna theprophetess (Luke 2:22 sqq.). No doubt this event, the first solemn introduction of Christ into the house of God, was in the earliest times celebrated in the Church of Jerusalem. We find it attested for the first half of the fourth century by the pilgrim of Bordeaux, Egeria or Silvia. The day (14 February) was solemnly kept by a procession to the Constantinian basilica of the Resurrection, a homily on Luke 2:22 sqq., and the Holy Sacrifice. But the feastthen had no proper name; it was simply called the fortieth day after Epiphany. This latter circumstance provesthat in Jerusalem Epiphany was then the feast of Christ's birth.