Charles Ellicott Commentary Psalms 45:7

"Thou hast loved righteousness, and hated wickedness: Therefore God, thy God, hath anointed thee With the oil of gladness above thy fellows." — Psalms 45:7 (ASV)

The oil of gladness. — Compare oil of joy, Isaiah 61:3. Here too it may be merely employed as a figure of happiness, but the bath and, no doubt, subsequent anointing, formed part of the Oriental marriage proceedings. (See Arabian Nights, found throughout.)

Fellows — that is, the paranymphs, or attendants on the bridegroom.