'Purification' in the Bible

When the days of their purification according to the law of Moses were fulfilled, they brought him up to Jerusalem, to present him to the Lord

There arose therefore a questioning on the part of John's disciples with some Jews about purification.

Then Paul took the men, and the next day, purified himself and went with them into the temple, declaring the fulfillment of the days of purification, until the offering was offered for every one of them.

His Son is the radiance of his glory, the very image of his substance, and upholding all things by the word of his power, when he had by himself made purification for our sins, sat down on the right hand of the Majesty on high;