Exodus 21:20-21 "And if a man smite his servant, or his maid, with a rod, and he die under his hand; he shall be surely punished. Notwithstanding, if he continue a day or two, he shall not be punished: for he is his money."
The servant will be severely punished, for though he knew his duty, he refused to do it. "But people who are not aware that they are doing wrong will be punished only lightly. Much is required from those to whom much is given, and much more is required from those to whom much more is given." (Luke 12:47-48 NLT)