The Didache serves as a good catechism in addressing particular questions about God’s commandments. For example, What does “Thou Shall not Kill” actually mean when God commands the Hebrews to kill the Canaanites? What does “Thou Shall not commit Adultery” mean to the unmarried? 
The Didache addresses both of these topics:
Do not murder; do not commit adultery; do not corrupt boys, do not fornicate (have relations outside of marriage); do not steal; do not practice magic; do not go in for sorcery; do not murder a child by abortion or kill a newborn infant.
Marcellino D’Ambrosio, in his book on the Church Fathers, explains that this is earliest known documentation in Christian literature that murder in accordance with the fifth commandment includes abortion. The document also references a code for sexual relations. Modernity attempts to profess that its views on human sexuality are new and progressive, but this could not be farther from the truth as explained by the Didache’s explanation on the sixth commandment for “In the Greco-Roman society of the time, religion had little to do with sexual morality. Adventuresome sexual exploration was the fashion.”
One of the most interesting facts that we find in the Didache is the instruction of Baptism. When I was a teenager, there was a church that would have bonfires after every football game and most of the high school kids would go to eat free pizza and roast marshmallows. After awhile, the youth minister of this particular church began to attempt to convert us to his faith. It got to the point that this particular youth minister began to tell us Catholics, and other mainstream Protestants, that we were not immersed when we baptized like Jesus in the Jordan River then our baptism was not valid.
So why do we believe our Baptism to be valid? Again, I cannot stress this enough, studying the early Christians allows us to defend our faith. First off, scripture doesn’t necessarily say that Jesus was immersed, it says that “he went up immediately from the water,” “And when he came up out of the water,” So imagine yourself on a riverbank, you have go down a hill to get into the river and to get out of the river you “went up” from it, or you come “up out of the water.” Now, it’s very possible, and even probable that Jesus was immersed, but just because the Gospel records a particular event doesn’t mean it’s a formula. In fact, the only formula for baptism in the Gospel is given at the end of the Gospel of Matthew:
19 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, 20 teaching them to observe all that I have commanded you; and lo, I am with you always, to the close of the age.”
Now, this could just be my particular interpretations of these particular text, I would imagine the youth minister in Mt. Sterling would tell me that these are Catholic apologist proof texts. So, I ask, what were the early Christian understanding of baptism.
The Didache reads:
“Baptize in running water, “In the name of the Father and of the Son and of the Holy Spirit.” (note that the only no negotiable is based on scripture) If you do not have running water, baptize in some other (form of water). If you cannot in cold, then in warm, If you have neither, then pour water on the head three times “in the name of the Father, Son, and Holy Spirit.”
The early Christians only understood two necessities: #1 The Scriptural Formula and #2 Water. Different variables of water were allowed, and sprinkling was also allowed by early Christians.
Please read the other posts in this series:
 Didache 2:2 Some argue that abortion was allowed in Judaism; however, we must also keep in mind that Divorce was allowed in Judaism as referenced in Mt. 19, but Christ explains the reasoning why Divorce displeases God. Regardless of Judaic arguments for or against abortion, our faith asserts that the Church has been given the authority to teach God’s will.
 D’Ambrosio, 13.
 Mt. 3:16
 Mk. 1:10
 Mt. 28:19
 Didache 7:2