What does the Bible say about Pharisees and hypocrisy?

In Matthew 23, Jesus directly confronts the Pharisees and scribes for their hypocrisy and outward displays of religion while neglecting the true spiritual matters of faith and mercy. He calls them 'hypocrites' and addresses their efforts to appear righteous before men, contrasting their actions with the true heart of the law, which is love for God and neighbor. This passage serves as a clear warning to Christians today to examine their own hearts and avoid becoming modern-day Pharisees who focus on ritual rather than genuine relationship with Christ.