Baptism in the name of Jesus Christ cleanses one of all past sins.
(Acts 2:38-39) You must repent, Peter answered and every one of you must be baptized in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. The promise that was made is for you and your children, and for all those who are far away, for all those whom the Lord our God is calling to himself.
(2 Peter 1:9-11) But if anyone does not have them, he is nearsighted and blind, and has forgotten that he has been cleansed from his past sins. Therefore, my brothers, be all the more eager to make your calling and election sure. For if you do these things, you will never fall, and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.
One will next receive the Holy Spirit, which may be given by the laying on hands or just be given to him or her.
The Holy Spirit will teach one to know God, and give one the grace to live the whole Word of God. When a person lives the whole Word of God, he or she will become temples of God.
(John 14:21-23) Whoever holds to my commandments and keeps them is the one who loves me; and whoever loves me will be loved by my Father, and I shall love him and reveal myself to him.' Judas not Judas Iscariot said to him, Lord, what has happened that you intend to show yourself to us and not to the world? Jesus replied: Anyone who loves me will keep my word and my Father will love him, and we shall come to him and make a home in him.
There is no sin in the temple of God/the kingdom of God. If one deliberately commits a sin after God has made a home in him or her, there is no repentance for them.
(1 John 3:9) No one, who has been begotten by God sins; because Gods seed remains inside him, he cannot sin when he has been begotten by God.
(Hebrews 10:26-31) If, after we have been given knowledge of the truth, we should deliberately commit any sins, then there is no longer any sacrifice for them. There is left only the dreadful prospect of judgment and of the fiery wrath that is to devour your enemies. Anyone who disregards the Law of Moses is ruthlessly put to death on the word of two witnesses or three; and you may be sure that anyone who tramples on the Son of God, and who treats the blood of the covenant which sanctified him as if it were not holy, and who insults the Spirit of grace, will be condemned to a far severer punishment. We are all aware who it was that said: Vengeance is mine; I will vindicate his people. It is a dreadful thing to fall into the hands of the living God.