John Calvin on Matthew 15:1/Mark 7:1

We see the extraordinary insolence that is displayed by men as to the form and manner of worshiping God; for they are perpetually contriving new modes of worship, and when any one wishes to be thought wiser than others, he displays his ingenuity on this subject. I speak not of foreigners, but of the very domestics of the Church, on whom God has conferred the peculiar honor of declaring with their lips the rule of godliness.

Emphasis added. "The very domestics of the Church."