They worship Me in vain; they teach as doctrine the precepts of men.’”
9. But in vain do they worship me The words of the prophet run literally thus: their fear toward me has been taught by the precept of men. But Christ has faithfully and accurately given the meaning, that in vain is God worshipped, when the will of men is substituted in the room of doctrine.
These men from Jerusalem, who should have been better, were worse. They accused Christ's disciples of breaking tradition by eating with unwashed hands, a decent custom the Pharisees had turned into a religious duty. That this was the worst charge they could bring shows how inoffensively His disciples lived.
AI summary
Commenting on Matthew 15:1-9
But in vain do they worship me,.... In the Hebrew text it is, "their fear towards me": which is rightly expressed here by "worship"; for the fear of God often intends the whole worship of God, both external and internal: here it only signifies external worship, which these men only attended to.