Didache 7

Now concerning baptism, thus baptize ye: having first uttered all these things, baptize into the name of the Father, and of the Son, and of the Holy Spirit, in running water. But if thou hast not running water, baptize in other water; and if thou canst not in cold, then in warm. But if thou hast neither, pour water upon the head thrice, into the name of the Father and Son and Holy Spirit. But before the baptism let the baptizer and the baptized fast, and whatever others can; but the baptized thou shalt command to fast for two or three days before.