Gill, “Nor are the customs of men a rule of judgment, or a direction which way men should take in matters of religion; for the customs of the people are for the most part vain (Jer. 20:3), and such as are not lawful for us, being Christians, to receive or observe (Acts 16:21); and concerning which we should say, We have no such custom, neither the churches of God (1 Cor. 11:16).
Custom is a tyrant, and ought to be rebelled against, and its yoke thrown off.
Nor are the traditions of men to be regarded; the Pharisees were very tenacious of the traditions of the elders, by which they transgressed the commandments of God, and made his word of no effect; and the apostle Paul, in his state of unregeneracy, was zealous of the same; but neither of them are to be imitated by us: it is right to observe the exhortation which the apostle gives, when a Christian (Col. 2:8); beware lest any man spoil you through philosophy and vain deceit, after the traditions of men, after the rudiments of the world, and not after Christ. Take care you are not imposed upon, under the notion and pretense of an apostolical tradition; unwritten traditions are not the rule, only the word of God is the rule of our faith and practice.” [from a sermon titled, The Scriptures: the only guide in matters of faith. text Jer. 6.16. preached on Nov. 2, 1750]