Charles Ellicott Commentary Psalms 102:20-21

"To hear the sighing of the prisoner; To loose those that are appointed to death; That men may declare the name of Jehovah in Zion, And his praise in Jerusalem;" — Psalms 102:20-21 (ASV)

Compare Isaiah 61:1-2, and generally the whole magnificent cycle of prophetic songs at the close of Isaiah.

Appointed to death. —See margin. Septuagint and Vulgate: “the sons of the slain.”