ישעיהו מ:ג פירוש: רש״י, מלבי״ם, Malbim Beur Hamilot ואבן עזרא

A voice The Holy Spirit calls, “In the desert, the way to Jerusalem.”

.A voice rings out. He describes that he hears a voice that rings out, because the prophet sees this as if it already happened, and describes in contrast how at the time where the ringing is quiet for a moment, he heard a voice saying "Proclaim!" (Verse 6), like hurry up and do not wait a minute, as will be explained there.

In the desert, in the wilderness. I explained the difference (above) 35:1.