Jesus said to His Ministers: "Keep on going into all the World, making all nations into disciples, baptizing them into the Name of the Father and the Son and the Holy Spirit — teaching them to keep on observing all things whatsoever I have commanded you! And look, I am always with you — even till the end of the World!" — Matthew 28:19 cf. Revelation 7:3f & 14:1-7 & 15:2-4.
Now "making all nations into disciples" means catechizing and baptizing all Christ-professing adults and their children, and then training such always to be faithful to the one true Triune God. Baptism is a badge or helmet to be worn lifelong on the head of every Christian Soldier, from the womb to the tomb. It requires allegiance to, and under the banner of, the King of kings.
As the Baptismal Formula states:1 "When we are baptized in the Name of the Father, God the Father witnesses and seals unto us that He makes an eternal Covenant of Grace with us and adopts us as His children and heirs, and therefore will provide us with every good thing and avert all evil from us or turn it to our profit. And when we are baptized in the Name of the Son, the Son seals unto us that He washes us in His blood from all our sins, incorporating us into the fellowship of His death and resurrection, so that we are freed from all our sins and accounted righteous before God. In like manner, when we are baptized in the Name of the Holy Ghost — the Holy Ghost assures us by this holy Sacrament that He will dwell in us and sanctify us to be members of Christ, applying unto us that which we have in Christ, namely…the daily renewing of our life, till we finally shall be presented without spot or wrinkle among the assembly of the elect in life eternal…. Whereas all covenants consist of two parts, therefore we are by God through Baptism admonished of and obliged unto a new obedience — namely, that we cleave to this one God (Father, Son, and Holy Ghost); that we trust in Him and love Him with all our heart, with all our soul, with all our mind, and with all our strength; and that we forsake the world, mortify our old nature, and keep on walking in a new and godly life."
The Catechism adds:2"The needful but…neglected duty of improving our Baptism, is to be performed by us all our life, especially in the time of temptation, and when we are present at the administration of it to others;a by serious and thankful consideration of the nature of it, and of the ends for which Christ instituted it, the privileges and benefits conferred and sealed thereby, and our solemn vow made therein;b by being humbled for our sinful defilement, our falling short of and walking contrary to the grace of Baptism and our engagements;c by growing up to assurance of pardon of sin and of all other blessings sealed to us in that Sacrament;d by drawing strength from the death and resurrection of Christ into Whom we are baptized for the mortifying of sin and quickening of grace;e and by endeavouring to live by faith,f to have our conversation in holiness and righteousnessg as those that have therein given up their names to Christ;h and to walk in brotherly love, as being baptized by the same Spirit into one body.i"
This is why the inspired Apostle Paul asks: "Shall we keep on continuing in sin, so that grace may abound? God forbid!… Don’t you know, that as many of us as have been baptized into Jesus Christ — were baptized into His death? Therefore we have been buried with Him by Baptism — into death. So that just like Christ was raised up again from the dead by the glory of the Father — even we too should keep on walking in newness of life. For as we have been planted together in the likeness of His death — we shall also be, in the likeness of His resurrection! Knowing this — that our old man has been crucified together with Him, so that the body of sin might be destroyed; so that from now on we should not keep on serving sin…. Regard yourselves to be dead indeed to sin — but alive unto God through Jesus Christ our Lord!…