Psalms 104:15 - Matthew Poole's English Annotations on the Holy Bible

Wine; he also bringeth out of the earth the vines which yield wine. Oil to make his face to shine: he alludes to the custom of those times and places, which was upon solemn and festival occasions to anoint their faces with oil. See Psalms 23:5. But these words with the former are by divers learned interpreters rendered otherwise, which seems more agreeable to the order and contexture of the Hebrew text, And (he giveth) wine that maketh glad the heart of man, to make (or, that he may make, i.e. that thereby he may also make) his face to shine more than oil, i.e. more than it shineth when it is anointed with oil; or, as with oil. So he speaks only of the wine, which he commends from two qualities, that it makes the heart cheerful, and the countenance pleasant. Bread, i.e. bread corn, by a metonymy. Which strengtheneth man's heart; which hath a singular faculty to preserve or renew our strength and rigour; whence it is called the staff of life.