Charles H. Spurgeon on Psalms 104:15

And oil to make his face to shine. Observe, after the mention of wine, he speaks of oil or ointment, because at the banquets among the Jews and other Eastern people, as afterwards among the Greeks and Romans, there was a frequent use of ointments. The reasons why ointment was poured upon the head were: To avoid intoxication: To improve the health: To contribute to pleasure and delight. Homer often refers to this custom, and there is an allusion to it by Solomon, Ec 9:8, "Let thy garments be always white; and let thy head lack no ointment". See also Ps 23:5. Le Blanc.