'Days of Purification' in the Bible

She will continue in purification from her bleeding for 33 days. She must not touch any holy thing or go into the sanctuary until completing her days of purification.

“When her days of purification are complete, whether for a son or daughter, she is to bring to the priest at the entrance to the tent of meeting a year-old male lamb for a burnt offering, and a young pigeon or a turtledove for a sin offering.

And when the days of purification were fulfilled according to the law of Moses, they brought him up to Jerusalem, to present him to the Lord:

Then Paul took the men, and the next day purifying himself with them entered into the temple, to signify the accomplishment of the days of purification, until that an offering should be offered for every one of them.