Look not thou upon the wine when it is red, when it giveth his colour in the cup, when it moveth itself aright.
Look not thou upon the wine when it is red. Do not be caught by its beautiful colour in the glass. Much sin enters the soul through the avenue of the eye.
When it giveth his colour - literally, its eye; its sparkle.
(When) it moveth itself aright - when it exhibits the appearance of sparkling motion through its generous fiery nature. It looks all right in the cup (Song of Solomon 7:9, "Wine ... that goeth down sweetly:" margin, straightly. Or omit "when," which is not in the Hebrew). The wine enters the mouth easily, and without anything to offend; but "at the last it biteth like a serpent" (Proverbs 23:32).