Pseudo-Chrysostom — as excerpted in the Catena Aurea on Mark 1:2-3

“(Vict. Ant. e. Cat. in Marc.) But the prophecy, by saying, In the wilderness, plainly shews that the divine teaching was not in Jerusalem, but in the wilderness, which was fulfilled to the letter by John the Baptist in the wilderness of Jordan, preaching the healthful appearing of the Word of God. (non occ.). The word of prophecy also shews, that besides the wilderness, which was pointed out by Moses, where he made paths, there was another wilderness, in which it proclaimed that the salvation of Christ was present.”