Go ye forth of Babylon: the imperative is here, as it is very frequently, put for the future, Ye shall go forth, &c.; for this is not so much a command as a promise; although this form of speech may be the rather used to intimate that it was their duty to go forth, as well as God's promise to carry them forth. With a voice of singing; with joy and songs of praise to the Lord. Declare ye; publish God's wonderful works on your behalf to all nations.
Related Commentaries of Isaiah 48:20
Isaiah 48:20
20 Go ye forth of 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, The LORD hath redeemed his servant Jacob.