Origen — as excerpted in the Catena Aurea on Luke 3:3-6

“Jordan is the same as descending, for there descends from God a river of healing water. But what parts would John be traversing but the country lying about Jordan, that the penitent sinner might soon arrive at the flowing stream, humbling himself to receive the baptism of repentance. For it is added, preaching the baptism of repentance for the remission of sins.”