Origen, on Num 33:7

“Departing from thence they came over against Phihahiroth, which looketh towards Beelsephon, and they camped before Magdalum.”

“Iroth is situated opposite Beelsephon [Baal-zephon] and opposite Magdalum. Beelsephon means "the ascent of the watchtower or citadel." So the soul ascends from small things to great and is not yet placed in that watchtower but opposite the watchtower, that is, in sight of the watchtower. For it begins to watch and to look for the future hope and to contemplate the height of the progresses; little by little it grows, while it is more nourished by hope than worn out by toils.”

Imported from an open dataset — not yet checked against the printed edition.