'Purifying' in the Bible

Then she shall remain [intimately separated] thirty-three days to be purified from the blood; she shall not touch any consecrated thing nor enter the [courtyard of the] sanctuary until the days of her purification are over.

‘When the days of her purification are completed, whether for a son or for a daughter, she shall bring to the priest at the doorway of the Tent of Meeting a one year old lamb as a burnt offering and a young pigeon or a turtledove as a sin offering;