Jamieson, Fausset and Brown on Isaiah 61:3

3. To appoint ... to give--The double verb, with the one and the same accusative, imparts glowing vehemence to the style.

beauty for ashes--There is a play on the sound and meaning of the Hebrew words, peer, epher, literally, "ornamental headdress" or tiara (Eze 24:17), worn in times of joy, instead of a headdress of "ashes," cast on the head in mourning (2Sa 13:19).

oil of joy--Perfumed ointment was poured on the guests at joyous feasts (Psa 23:5; 45:7, 8; Am 6:6). On occasions of grief its use was laid aside (2Sa 14:2).

garment of praise--bright-colored garments, indicative of thankfulness, instead of those that indicate despondency, as sackcloth (Joh 16:20).

trees of righteousness--Hebrew, terebinth trees; symbolical of men strong in righteousness, instead of being, as heretofore, bowed down as a reed with sin and calamity (Is 1:29, 30; 42:3; 1Ki 14:15; Psa 1:3; 92:12-14; Jr 17:8).

planting of ... Lord--(See on Is 60:21).

that he might be glorified--(Joh 15:8).