'Purification' in the Bible

When the time came for their purification according to the Law of Moses, Joseph and Mary took Jesus up to Jerusalem to present him to the Lord,

Now standing there were six stone water jars used for the Jewish rites of purification, each one holding from two to three measures.

Then a controversy about ritual purification sprang up between a certain Jew and John's disciples,

Take these men, go through the purification ceremony with them, and pay their expenses to shave their heads. Then everyone will know that there is nothing in what they have been told about you, but that you are carefully observing and keeping the Law.

Then Paul took those men and the next day purified himself with them. Then he went into the Temple to announce the time when their days of purification would end and when the sacrifice would be offered for each of them.

They found me in the Temple doing these things just as I had completed the purification ceremony. No crowd or noisy mob was present.