Justin (Martyr) (Rome, 100-165), First Apology, Ch. 61
"They (those to be baptized) then are brought by us where
there is water, and are regenerated in the same manner in
which we were ourselves regenerated. For, in the name of
God, the Father and Lord of the universe, and of our Savior
Jesus Christ, and of the Holy Spirit, they then receive the
washing with water ... The reason for this we have received
from the Apostles."