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Yet you didn't answer -- I answered your question -- EXPLAIN THE THIEF ON THE CROSS.

hen did Jesus tell the theif that he would be in heaven?

BEFORE Jesus Christ died, right?

The thief lived under the OLD Covenant who received the grace and mercy of the Lord. The NEW covenant was not inaugurated until Jesus Christ's death on the Cross, refer Colossians 2:12-17

12Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.

13And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;

14Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;

15And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.

16Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:

17Which are a shadow of things to come; but the body is of Christ.

Christ ended the Old Testament nailing it to his cross;

Remember that each of God's covenants was with a sacrifice -- and for the Jews in the OT, there was forgiveness of sins which involved an animal sacrifice at the temple -- and in the case of the New Covenant of Christ this was the sacrifice of Jesus Christ on the cross

Baptism in the name of Jesus Christ is commanded after THE RESURRECTION read Matthew 28:18-20

18And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
19Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:

20Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.

or Mark 16:15-16

15And he said unto them, Go ye into all the world, and preach the gospel to every creature.
16He that believeth and is baptized shall be saved; but he that believeth not shall be damned.

the thief was promised in the OLD Covenant while in his Passover Christ opened to all men the fountain of Baptism. He had already spoken of his Passion, which he was about to suffer in Jerusalem, as a "Baptism" with which he had to be baptized
Mk 10:38

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