Charles Ellicott Commentary Galatians 5:14

"For the whole law is fulfilled in one word, [even] in this: Thou shalt love thy neighbor as thyself." — Galatians 5:14 (ASV)

This verse is another of the marked points of contact between this Epistle and that to the Romans. The theme of it is worked out at length in Romans 13:8-10.

Your neighbor. In the original command, this appears to mean “your fellow Israelite.” Our Lord, in the parable of the Good Samaritan, had given it a wider meaning, and it is used here in that same wider sense.