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Mat 28:19 Going therefore, teach ye all nations: baptizing them in the name of the Father and of the Son and of the Holy Ghost.
Mat 28:20 Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.

So what did Jesus teach them that they are to do??? Do you know???

Well, St. Paul tells us of this:

1Co 11:23 For I have received of the Lord that which also I delivered unto you, that the Lord Jesus, the same night in which he was betrayed, took bread,
1Co 11:24 And giving thanks, broke and said: Take ye and eat: This is my body, which shall be delivered for you. This do for the commemoration of me.
1Co 11:25 In like manner also the chalice, after he had supped, saying: This chalice is the new testament in my blood. This do ye, as often as you shall drink, for the commemoration of me.
1Co 11:26 For as often as you shall eat this bread and drink the chalice, you shall shew the death of the Lord, until he come.
1Co 11:27 Therefore, whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord.
1Co 11:28 But let a man prove himself: and so let him eat of that bread and drink of the chalice.
1Co 11:29 For he that eateth and drinketh unworthily eateth and drinketh judgment to himself, not discerning the body of the Lord.

Here's another command of Christ, to St. Peter:

Mat 16:18 And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it.
Mat 16:19 And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose on earth, it shall be loosed also in heaven.

And another, to all of His Disciples there gathered:

Mat 18:18 Amen I say to you, whatsoever you shall bind upon earth, shall be bound also in heaven: and whatsoever you shall loose upon earth, shall be loosed also in heaven.
Mat 18:19 Again I say to you, that if two of you shall consent upon earth, concerning anything whatsoever they shall ask, it shall be done to them by my Father who is in heaven.