"The redeemed" refers to the people whom Yahweh has saved. Alternate translation: "those whom Yahweh has saved" (See: [[rc://en/ta/man/translate/figs-nominaladj]])
Here the four directions are given to emphasize that he gather them from everywhere. Alternate translation: "from every direction" or "from every part of the world" (See: [[rc://en/ta/man/translate/figs-merism]])