The Didache describes the practices of Baptism in the first century:
Chapter 7. Concerning Baptism
And concerning
baptism,
baptize this way: Having first said all these things,
baptize into the name of the
Father, and of the
Son, and of the
Holy Spirit,
Matthew 28:19 in living water. But if you have not living water,
baptize into other water; and if you can not in cold, in warm. But if you have not either, pour out water thrice upon the head into the name of Father and Son and
Holy Spirit. But before the
baptism let the baptizer fast, and the
baptized, and whatever others can; but you shall order the
baptized to fast one or two days before.
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