Charles Ellicott Commentary Isaiah 48:20

"Go ye forth from Babylon, flee ye from the Chaldeans; with a voice of singing declare ye, tell this, utter it even to the end of the earth: say ye, Jehovah hath redeemed his servant Jacob." — Isaiah 48:20 (ASV)

Go you forth from Babylon ... —The sorrow and sighing are past, and the prophet speaks to the remnant that shall return. They are to act without fear on the promises of God, on the decree of Cyrus, and to start at once on their homeward journey, and as they go, to proclaim what great things God has done for them.