Baptism foreshadowed in the Old Testament :
(Gen1:2) 2But the earth was empty and unoccupied, and darknesses were over the face of the abyss; and so the Spirit of God was brought over the waters.
(2Kgs5:13-14) 13his servants approached him, and they said to him: “If the prophet had told you, father, to do something great, certainly you ought to have done it. How much more so, now that he has said to you: ‘Wash, and you will be clean?’ ” 14So he descended and washed in the Jordan seven times, in accord with the word of the man of God. And his flesh was restored, like the flesh of a little child. And he was made clean.
(Ezek36:25-26) 25And I will pour clean water over you, and you shall be cleansed from all your filth, and I will cleanse you from all your idols. 26And I will give to you a new heart, and I will place in you a new spirit. And I will take away the heart of stone from your body, and I will give to you a heart of flesh.
(1Pet3:20-21) 20who had been unbelieving in past times, while they waited for the patience of God, as in the days of Noah, when the ark was being built. In that ark, a few, that is, eight souls, were saved by water. 21And now you also are saved, in a similar manner, by baptism, not by the testimony of sordid flesh, but by the examination of a good conscience in God, through the resurrection of Jesus Christ.
Infant Baptism :
(Lev12:3) 3And on the eighth day, the little infant shall be circumcised.
Baptism is the circumcision of the New Covenant : (Colossians2:11-12) 11In him also, you have been circumcised with a circumcision not made by hand, not by the despoiling of the body of flesh, but by the circumcision of Christ. 12You have been buried with him in baptism. In him also, you have risen again through faith, by the work of God, who raised him up from the dead.
(Lk18:15-16) 15And they were bringing little children to him, so that he might touch them. And when the disciples saw this, they rebuked them. 16But Jesus, calling them together, said: “Allow the children to come to me, and do not be an obstacle to them. For of such is the kingdom of God.
(Mt3:13-17) 13Then Jesus came from Galilee, to John at the Jordan, in order to be baptized by him. 14But John refused him, saying, “I ought to be baptized by you, and yet you come to me?” 15And responding, Jesus said to him: “Permit this for now. For in this way it is fitting for us to fulfill all justice.” Then he allowed him. 16And Jesus, having been baptized, ascended from the water immediately, and behold, the heavens were opened to him. And he saw the Spirit of God descending like a dove, and alighting on him. 17And behold, there was a voice from heaven, saying: “This is my beloved Son, in whom I am well pleased.”
(Mt28:18-20) 18And Jesus, drawing near, spoke to them, saying: “All authority has been given to me in heaven and on earth. 19Therefore, go forth and teach all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20teaching them to observe all that I have ever commanded you. And behold, I am with you always, even to the consummation of the age.”
(Mk16:15-16) 15And he said to them: “Go forth to the whole world and preach the Gospel to every creature. 16Whoever will have believed and been baptized will be saved. Yet truly, whoever will not have believed will be condemned.
(Jn3:5) 5Jesus responded: “Amen, amen, I say to you, unless one has been reborn by water and the Holy Spirit, he is not able to enter into the kingdom of God.
(Jn3:22) 22After these things, Jesus and his disciples went into the land of Judea. And he was living there with them and baptizing.
(Acts2:38-39) 38Yet truly, Peter said to them: “Do penance; and be baptized, each one of you, in the name of Jesus Christ, for the remission of your sins. And you shall receive the gift of the Holy Spirit. 39For the Promise is for you and for your sons, and for all who are far away: for whomever the Lord our God will have called.”
(Acts16:33) 33And he, taking them in the same hour of the night, washed their scourges. And he was baptized, and next his entire household.
(Acts22:16) 16And now, why do you delay? Rise up, and be baptized, and wash away your sins, by invoking his name.’
(Rom6:3-5) 3Do you not know that those of us who have been baptized in Christ Jesus have been baptized into his death? 4For through baptism we have been buried with him into death, so that, in the manner that Christ rose from the dead, by the glory of the Father, so may we also walk in the newness of life. 5For if we have been planted together, in the likeness of his death, so shall we also be, in the likeness of his resurrection.
(1Cor6:11) 11And some of you were like this. But you have been absolved, but you have been sanctified, but you have been justified: all in the name of our Lord Jesus Christ and in the Spirit of our God.
(1Cor10:1-2) 1For I do not want you to be ignorant, brothers, that our fathers were all under the cloud, and they all went across the sea. 2And in Moses, they all were baptized, in the cloud and in the sea.
(1Cor12:13) 13And indeed, in one Spirit, we were all baptized into one body, whether Jews or Gentiles, whether servant or free. And we all drank in the one Spirit.
(Ga3:27-28) 27For as many of you as have been baptized in Christ have become clothed with Christ. 28There is neither Jew nor Greek; there is neither servant nor free; there is neither male nor female. For you are all one in Christ Jesus.
(Eph4:5) 5one Lord, one faith, one baptism,
(Eph5:25-27) 25Husbands, love your wives, just as Christ also loved the Church and handed himself over for her, 26so that he might sanctify her, washing her clean by water and the Word of life, 27so that he might offer her to himself as a glorious Church, not having any spot or wrinkle or any such thing, so that she would be holy and immaculate.
(Tit3:5) 5And he saved us, not by works of justice that we had done, but, in accord with his mercy, by the washing of regeneration and by the renovation of the Holy Spirit,