Such a bath is called a mikvah, and consists of 5760 egg volumes of water.
Mikveh is the same word used for baptism.
To this day in conservative Judaism a bride cannot marry without a Mikveh.
Leviticus 15:18 The woman also with whom man shall lie with seed of copulation, they shall both bathe [07364 rachats] themselves in water, and be unclean until the even.
8 Now when I passed by thee, and looked upon thee, behold, thy time was the time of love; and I spread my skirt over thee, and covered thy
nakedness: yea, I sware unto thee, and entered into a covenant with thee, saith the Lord GOD, and thou becamest mine.
9 Then washed I thee with water; yea, I throughly washed away thy blood from thee, and I anointed thee with oil.
10 I clothed thee also with broidered work, and shod thee with badgers' skin, and I girded thee about with fine linen, and I covered thee with silk.
11 I decked thee also with ornaments, and I put bracelets upon thy hands, and a chain on thy neck.
12 And I put a jewel on thy forehead, and earrings in thine ears, and a beautiful crown upon thine head.
13 Thus wast thou decked with gold and silver; and thy raiment was of fine linen, and silk, and broidered work; thou didst eat fine flour, and honey,
and oil: and thou wast exceeding beautiful, and thou didst prosper into a kingdom.
14 And thy renown went forth among the heathen for thy beauty: for it was perfect through my comeliness, which I had put upon thee, saith the Lord GOD.
Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
We are cleansed by reading the Word of God, the Bible, by Jesus, who is the Word. John 1:1.
Ephesians 5:26 That he might sanctify and cleanse it with the washing
of water by the word,
Ephesians 5:27 That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish.
There is a rapture at a baptism in Acts:8:
38 And he commanded the chariot to stand still: and they went down both
into the water, both Philip and the eunuch; and he baptized him.
39 And when they were come up out of the water, the Spirit of the Lord caught away* Philip, that the eunuch saw him no more: and he went on his way rejoicing.
40 But Philip was found at Azotus: and passing through he preached in all the cities, till he came to Caesarea.
*[caught away = harpazo--the same word used in 1 Thess 4 for "caught up" or rapture]