Lips near, hearts far away
Jesus said that Isaiah had correctly prophesied about religious leaders who honored God with their lips while their hearts remained far from Him.
Therefore the Lord said: “These people draw near to Me with their mouths and honor Me with their lips, but their hearts are far from Me. Their worship of Me is but rules taught by men.
Isaiah 29:13 describes people whose mouths draw near to God while their hearts remain far away and whose worship consists of human rules; Matthew 15:7-9 quotes those words as Jesus rebukes traditions that nullify God's command.