The point is the Didache was not written by the original apostles: The Bible instructs people are to hold fast to the apostles’ doctrine/teachings. (Acts 2:42) It was the Apostle Paul who said after his death men would begin speaking perverse things, drawing people away from the truth. (Acts 20:28-32) Perverse things are contrary to the accepted or expected standard or practice.
The following Didache instructions do not exist, and in fact are contrary to what's found in the biblical record:
Confess your sins in church
Concerning baptism, baptize in this way. Having instructed him in all of these teachings, baptize the catechumen in the name of the Father, and of the Son, and of the Holy Spirit, in running water. But if you do not have running water, then baptize in other water. And if you cannot in cold water, use warm. But if you have neither, then pour water on the head three times, in the name of the Father, and of the Son, and of the Holy Spirit. And before the baptism, let both the baptizer and the catechumen fast, and also any others who are able. And be sure that the catechumen fasts a day or two before.
FASTING d o NoT let not your fasts fall on the same days as the hypocrites, for they fast on Mondays and Thursdays. Keep your fast on Wednesdays and Fridays.
Pray the Lord’s Prayer 3 x a day. - CONCERNING PRAYER d o NoT pray as the hypocrites either, but pray as the Lord commanded in His Gospel: Our Father, who art in heaven, hallowed be thy name; thy kingdom come; thy will be done, on earth as it is in heaven; give us this day our daily bread; and forgive us our trespasses, as we forgive those who trespass against us; and lead us not into temptation, but deliver us from the evil one; for thine is the power and the glory unto ages of ages. Pray this way three times each day.
Concerning apostles and prophets, act according to the Gospel’s teaching. Receive every apostle as the Lord. He should not stay for more than a single day, or two days if necessary. But if he remains for three days, he is a false prophet. When he leaves, let the apostle receive nothing except bread, until he finds a place to stay. But if he asks for money, he is a false prophet. Do not test or judge any prophet who speaks in the Spirit. Every other sin will be forgiven, but this sin will not be forgiven. And not everyone who speaks in the Spirit is a prophet, but only he who follows the ways of the Lord. From his behavior, then, you will know a false prophet from a true prophet. Any prophet who orders a meal in Spirit will not eat from it, but if he does eat of it, he is a false prophet. Any prophet who teaches the truth, but does not do the things he teaches, is a false prophet. Every true prophet, if he performs a worldly mystery of the Church, but does not teach others to do likewise, he must not be judged by you. He has his judgment in the presence of God, as with the prophets of old. If anyone says in the Spirit, “Give me money,” do not listen to him. But if he tells you to give to others who are in need, let no one judge him.
N ow concerning the eucharistic thanksgiving, give thanks in this way. First, as concerning the cup: We give you thanks, our Father, for the holy vine of your son David,a which you made known to us through your Son Jesus. Yours is the glory unto ages of ages. Then as regards the broken bread: We give you thanks, our Father, for the life and knowledge which you made known to us through your Son Jesus. Yours is the glory unto ages of ages. ????As this broken bread was scattered upon the mountains and being gathered together became one, ???? u Acts 15:29. v Mat. 28:19. w Mat. 6:16. x Mat. 6:5f. y Mat. 6:9f. z 1 Cor. 11:23-25. a John 15:1. b Acts 3:13, 26. c John 3:15, 5:26, 6:68f. DIDACHE 9 so may your Church be gathered together from the ends of the earth into your kingdom. For yours is the glory and the power through Jesus Christ unto ages of ages. Do not let anyone eat or drink of this Eucharist who has not been baptized into the name of the Lord, for concerning this the Lord has said, “Do not give the holy things to the dogs.”
GaTher together each Sunday,a break bread and give thanks,???? first confessing your sins, ???? that your sacrifice may be pure.