Matthew 23:23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
Jesus rebukes the Pharisees because they are not preaching the law, judgment, mercy, and faith:
law: the commandments
judgment: we face judgment because we violate the law
mercy: God shows us mercy by giving his son to pay the penalty for us
faith: believing that the Lord Jesus Christ endured God’s wrath in our place.