Galatians 5:15 - Matthew Poole's English Annotations on the Holy Bible

This lets us know, that there were great contentions and divisions amongst the members of this church, whether (which is probable) occasioned by their differences in and about the doctrine of justification, or upon other accounts, we are not told; but upon whatever account they were raised, they were contrary to that serving one another in love, to which the apostle had exhorted them. Nor did they terminate in a mere dislike of and displacency to each other, but broke out into overt acts, more becoming dogs than Christians, and therefore it is expressed under the notion of biting and devouring. The issue of which, the apostle prophesieth would be a consuming one another; they being actions that had a natural tendency to this end.