Jesus first forgives our sins when we believe and repent and are baptized. Any sins committed after Baptism must be repented or else Jesus will not forgive them.
1 Timothy 5:8 "But if anyone does not provide for his own, and especially for those of his household, he has denied the faith and is worse than an unbeliever."
A Baptized/saved person who denies the faith by his failure to provide for his own relatives is judged worse than an unbeliever and so he is definitely no longer saved.
Titus 1:16 " They profess to know God, but in works they deny Him, being abominable, disobedient, and disqualified for every good work."
1 John 2:4 "He who says, “I know Him,†and does not keep His commandments, is a liar, and the truth is not in him."
What happens to all liars if they do not repent before death?
Revelation 21:8 "But the cowardly, unbelieving, abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars shall have their part in the lake which burns with fire and brimstone, which is the second death."
His free gift of grace given to us through Baptism reconciles us to His Father but it is our responsibility to continue to be reconciled until we die if we desire to enter into eternal life. We continue our reconciliation through obedience to God's commandments.
Jesus teaches us:
Matthew 19:16-19 "Now behold, one came and said to Him, “Good Teacher, what good thing shall I do that I may have eternal life?â€
17 So He said to him, “Why do you call Me good? No one is good but One, that is, God. But if you want to enter into life, keep the commandments.†18 He said to Him, “Which ones?†Jesus said, “ ‘You shall not murder,’ ‘You shall not commit adultery,’ ‘You shall not steal,’ ‘You shall not bear false witness,’ 19 ‘Honor your father and your mother,’ and, ‘You shall love your neighbor as yourself."
It does not get any plainer than this in Scripture.
Jesus came to earth to do the work His Father sent Him to do. What was this work?
Luke 24:44 "Then He said to them, “These are the words which I spoke to you while I was still with you, that all things must be fulfilled which were written in the Law of Moses and the Prophets and the Psalms concerning Me."
Jesus came to earth to do/fulfill the things concerning Him which were written/prophesied in the Law of Moses, and the Prophets, and the Psalms.
On the cross, Jesus stated, "It is finished."
What was finished?
The things written in the Law of Moses, and the Prophets, and the Psalms about Him were all finished (fulfilled, completed), and the very last thing prophesied to be fulfilled (finished) was His death on the cross.
Jesus did His Father's will and this included His death on the cross.
Philippians 2:5-11 "Let this mind be in you which was also in Christ Jesus, 6 who, being in the form of God, did not consider it robbery to be equal with God, 7 but made Himself of no reputation, taking the form of a bondservant, and coming in the likeness of men. 8 And being found in appearance as a man, He humbled Himself and became obedient to the point of death, even the death of the cross. 9 Therefore God also has highly exalted Him and given Him the name which is above every name, 10 that at the name of Jesus every knee should bow, of those in heaven, and of those on earth, and of those under the earth, 11 and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father."
John 6:38 "For I have come down from heaven, not to do My own will, but the will of Him who sent Me."
We must follow Him (imitate His life of obedience to His Father until death) if we desire to be counted worthy of His Sacrifice and be considered worthy to enter into eternal life.
Luke 9:23 "Then He said to them all, “If anyone desires to come after Me, let him deny himself, and take up his cross daily, and follow Me."
Matthew 10:38 "And he who does not take his cross and follow after Me is not worthy of Me."
Romans 12:1 "I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service."
1 Corinthians 6:9-10 "Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, 10 nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God."
Galatians 5:19-21 "Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness, 20 idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, 21 envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God."
Ephesians 5:3-6 "But fornication and all uncleanness or covetousness, let it not even be named among you, as is fitting for saints; 4 neither filthiness, nor foolish talking, nor coarse jesting, which are not fitting, but rather giving of thanks. 5 For this you know, that no fornicator, unclean person, nor covetous man, who is an idolater, has any inheritance in the kingdom of Christ and God. 6 Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience."