The book Apostolic Tradition is a Christian text which dates from the 3rd century A.D. It’s traditionally attributed to a man named Hippolytus, though the work may well be an edited compilation. It describes liturgical practices from the 3rd century, so it’s a very interesting time-capsule of early church practice. One translator cautioned that, just because liturgy reads a certain way in Apostolic Tradition, we shouldn’t blindly assume this reflected actual practice; this document could be compiled musings of several armchair liturgists, after all!1
Here, in this excerpt, we see what Apostolic Tradition had to say about the ordinance of baptism. There is some very interesting context to this account (paragraphs 15 – 19) that space will not permit me to provide.
Of those who will receive baptism:2
When those who are to receive baptism are chosen their lives should be examined; whether they lived uprightly as catechumens, whether they honored the widows, whether they visited the sick, whether they were thorough in performing good works; and if those who brought them bear witness that they have acted thus, so they should hear the Gospel.