Legal definition:
A person who will legally receive money, property, or a title from another person, especially an older member of the same family, when that other person dies:
When you believe (1 Corinthians 15:1-4) … how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures: and then act upon it (Romans 10:9) That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
You are then a child of God. A joint Heir to eternity:
Romans 8:17 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
Galatians 3:29 And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
Galatians 4:7 Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.
Ephesians 3:6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
Titus 3:7 That being justified by his grace, we should be made heirs according to the hope of eternal life.
Jew or Gentile, are you in the family of God?
A JOINT HEIR WITH CHRIST