What does the Bible say about dogs and swine in Matthew 7:6?

Matthew 7:6 states, 'Give not that which is holy unto dogs, neither cast ye your pearls before swine.' In this passage, dogs symbolize those who are self-righteous legalists who reject the gospel of grace, while swine represent those who refuse salvation by God's grace. The verse teaches discernment in sharing the gospel, encouraging believers to avoid constantly confronting those who have willfully rejected Christ. Instead, they should focus on preaching the gospel to all, leaving the judgment of those who have turned away to God.