Galatians 5:13-15 Let us not use our freedom to gratify your flesh.

For you, brothers, were called to freedom. Only do not turn your freedom into an opportunity to gratify your flesh, but through love make it your habit to serve one another. For the whole Law is summarized in a single statement: "You must love your neighbor as yourself." But if you bite and devour one another, be careful that you are not destroyed by each other. The gospel is a doctrine according to godliness, 1 tim 6:3

If anyone teaches false doctrine and refuses to agree with the sound words of our Lord Jesus, the Messiah, and godly teaching, and so it gives no ground to sin

If any man teach otherwise -

Any otherwise than that respect should be shown to masters; and that a more cheerful and ready service should be rendered because they were Christians. It is evidently implied here that some might be disposed to inculcate such views of religion as would produce discontent and a spirit of insubordination among those who were held to servitude. Who they were is not known, nor is it known what arguments they would employ to do it. It would seem probable that the arguments which would be employed would be such as these: that God made all people equal; that all had been redeemed by the same blood; that all true Christians were fellow-heirs of heaven; and that it was wrong to hold a Christian brother in bondage, etc. From undeniable principles it would seem that they drew the inference that slaves ought at once to assert their freedom; that they should refuse obedience to their masters; and that the tendency of their teaching was, instead of removing the evil by the gradual and silent influence of Christian principles, to produce discontent and insurrection. From some of the expressions here used by the apostle, as characteristic of these teachers, it would seem to be probable that these persons were Jews. They were people given to subtle disputations, and those who doted about questions and verbal disputes, and who were intent on gain, supposing that that which conduced to mere worldly prosperity was of course religion. These characteristics apply well to Jewish teachers.

And consent not to wholesome words -

Words conducing to a healthful state of the church; that is, doctrines tending to produce order and a due observance of the proprieties of life; doctrines leading to contentment, and sober industry, and the patient endurance of evils.

Even the words of our Lord Jesus Christ -

The doctrines of the Saviour - all of which tended to a quiet life, and to a patient endurance of wrongs.

And to the doctrine which is according to godliness -

Which tends to produce piety or religion; that is, the doctrine which would be most favorable to an easy and rapid propagation of the gospel. The idea seems to be, that such a state of insubordination and discontent as they would produce, would be unfavorable to the promotion of religion. Who can doubt it?

The apostle urges that all the law is fulfilled in one word, even in this, Thou shalt love thy neighbour as thyself. If Christians, who should help one another, and rejoice one another, quarrel, what can be expected but that the God of love should deny his grace, that the Spirit of love should depart, and the evil spirit, who seeks their destruction, should prevail? Happy would it be, if Christians, instead of biting and devouring one another on account of different opinions, would set themselves against sin in themselves, and in the places where they live.