Didascalia Apostolorum

“Now our rod is the Word of God, Jesus Christ, as Jeremiah saw him as an almond rod. So everyone that spares his son a word of rebuke hates his son. Therefore teach your sons the word of the Lord. Punish them with lashes. Subdue them by your word of religion from their youth.”

“Those who are not saved always are taking care of those things that do not profit or benefit them in any way. So what kind of excuse is there for a Christian who withdraws from the assembly of the church? Such a person does not even imitate the Gentiles but by reason of his absence grows indifferent and careless. He stands aloof and does evil. The Lord said, … You have not walked in my statutes or kept my ordinances, and have not even acted according to the rules of the nations that are all around you, "you were more corrupt than they in all your ways." How, then, shall the indifferent excuse himself, since he has no zeal for the assembly of the church? If anyone takes the occasion of worldly business to withdraw, let him know this: the trades of the faithful are called works of surplus, for their true work is religion. Pursue your trades, therefore, as a work of surplus, for your sustenance, but let your true work be religion.”

“Circumcision of the heart is sufficient for the faithful. It is spiritual, as he said by Jeremiah; light a lamp and "sow not among thorns. Circumcise yourselves to the Lord. Remove the foreskin of your hearts, O MEN OF JUDAH."”

“We must conduct our festivals and rejoice with fear and trembling. A faithful Christian, the psalm says, must not sing the songs of the heathen or have anything to do with the principles and doctrines of strange assemblies. It may happen that through their songs, he might make mention of the names of idols, which God forbids the faithful to do. The Lord scolds certain people through Jeremiah and says, "Your children have forsaken me, and have sworn by those who are no gods."”