They gave me also gall for my meat. Here, at any rate, the psalmist is inspired to be Messianic, i.e. to use words which, while they can only be applied to himself metaphorically and loosely, are in the strictest and most literal sense applicable to Christ.
Gall was actually mingled with the drink which was given to Christ just before he was crucified, and which he tasted, but would not swallow (Matthew 27:34). And in my thirst they gave me vinegar to drink.
Similarly, when upon the cress Christ uttered the words, "I thirst," those who stood by "filled a sponge with vinegar, and put it upon hyssop, and put it to his month. When Jesus therefore had received the vinegar, he said, It is finished; and he bowed his head, and gave up the ghost" (John 19:29, John 19:30); comp.
Psalms 22:16-18, where little facts, not true of David, but true of Christ, are recorded of an afflicted one, who partly represents David, partly his great Descendant.