Albert Barnes Commentary Isaiah 43:21

"the people which I formed for myself, that they might set forth my praise." — Isaiah 43:21 (ASV)

This people have I formed for myself—to preserve the remembrance of my name; to transmit the knowledge of the true God to future times, and to celebrate my praise (see the notes at Isaiah 43:1).

They shall proclaim my praise—they shall celebrate my goodness; or, by their restoration to their own land, they shall clearly show that they are my people.