1 John 2: 1
1 My little children, these things I write to you, so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous.
Jesus is advocate of all believers. Advocate means helper. In modern concept, it has a similar meaning of defense attorney. The persecutor of believers is Satan who persecutes believers day and night before God (Revelation 12:10). Ordinary defense attorneys defend with arguments such that the defendants may be acquitted and will perhaps present a plea for mercy if the defendants are proven guilty. Unlike ordinary attorneys, Jesus defends us with His sacrificial love by settling the requirement of justice by His own death on the cross. However, we should also understand that Jesus does not defend us such that we may stay in sins. Rather, Jesus paid for the penality of sins for us so that we may live a new and free life. He impowers us to become a new creation that glorifies God (2 Corinthians 5:17). The impowerment is through the works of the Holy Spirt who make us a new human being such that believers are spiritually born again. As a matter of fact, Jesus says that being born again is required to enter the kingdom of God (John 3:5). Notice that believers are born again by the works of the Holy Spirit who renews believers with the word of God (Ephesians 5:26) and believers are not giving birth to themselves by their own efforts transforming themselves acceptable to God (Titus 3:5). Jesus promises that he who believe in Him will receive the Holy Spirit who is like streams of living water flowing within the believers (John 7:38-39). The Holy Spirit came when Jesus was crucified, died and resurrected (John 16:7). Believing in Jesus implies loving Him and obeying Jesus' word (John 14:15-17). This fully fulfills the mission of Jesus who came to the world to save sinners (John 3:17).
Revelation 12:10
10 Then I heard a loud voice saying in heaven, “Now salvation, and strength, and the kingdom of our God, and the power of His Christ have come, for the accuser of our brethren, who accused them before our God day and night, has been cast down.
2 Corinthians 5:17
17 Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.
John 3:5
5 Jesus answered, “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.
Ephesians 5:26
26 that He might sanctify and cleanse her with the washing of water by the word,
Titus 3:5
5 not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit,
John 7:38-39
38 He who believes in Me, as the Scripture has said, out of his heart will flow rivers of living water.” 39 But this He spoke concerning the Spirit, whom those believing in Him would receive; for the Holy Spirit was not yet given, because Jesus was not yet glorified.
John 16:7
7 Nevertheless I tell you the truth. It is to your advantage that I go away; for if I do not go away, the Helper will not come to you; but if I depart, I will send Him to you.
John 14:15-17
15 “If you love Me, keep My commandments. 16 And I will pray the Father, and He will give you another Helper, that He may abide with you forever— 17 the Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you.
John3:17
17 For God did not send His Son into the world to condemn the world, but that the world through Him might be saved.