Questions about the Word, the Church and the Ordinances
128 Q. Why Did Christ give these ordinances [baptism and the Lord’s Supper]?
A. To show that his disciples belong to him, and to remind them of what he has done for them.
(Click through to read scriptural proofs.)
Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit.
… and when he had given thanks, he broke it, and said, “This is my body which is for you. Do this in remembrance of me.” In the same way also he took the cup, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.” For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes.
Scripture quoted from the English Standard Version.
Taken from A Catechism for Girls and Boys found here.