Jesus answered him, "Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God."
--- John 3:3
That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.
--- John 3:6
And Peter said to them, "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit."
--- Acts 2:38
He saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, --- Titus 3:5
However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him.
10 If Christ is in you, though the body is dead because of sin, yet the spirit is alive because of righteousness.
11 But if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ Jesus from the dead will also give life to your mortal bodies through His Spirit who dwells in you.
--- Romans 8:9-11
The Bible says:
"Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test!" -- 2 Corinthians 13:5
This video will help you determine if you have saving faith and are born again:
Marks of the True Christian:
"Let love be genuine. Abhor what is evil; hold fast to what is good.
Love one another with brotherly affection. Outdo one another in showing honor.
Do not be slothful in zeal, be fervent in spirit, serve the Lord.
Rejoice in hope, be patient in tribulation, be constant in prayer.
Contribute to the needs of the saints and seek to show hospitality.
Bless those who persecute you; bless and do not curse them.
Rejoice with those who rejoice, weep with those who weep.
Live in harmony with one another. Do not be haughty, but associate with the lowly. Never be wise in your own sight.
Repay no one evil for evil, but give thought to do what is honorable in the sight of all.
If possible, so far as it depends on you, live peaceably with all.
Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, "Vengeance is mine, I will repay, says the Lord."
To the contrary, "if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head."
Do not be overcome by evil, but overcome evil with good."
--- Romans 12:9-21
"Even though I walk through the valley of the shadow of death, I will fear no evil, for you are with me; your rod and your staff, they comfort me."
--- Psalms 23:4