M. Winger, The law of Christ (Epistolary metaphors and the Pauline relativization of Jewish law in Galatians-V,16-25), NEW TEST ST, 46(4), 2000, pp. 537-546
Paul's phrase 'the law of Christ,' used without explanation in Gal. 6.2, me
ans neither some form of words (such as Lev. 19.18), nor a norm constituted
by the example of Christ himself. It is rather a metaphor for what, in the
life of those who belong to Christ, occupies the place that law had in the
life of those who came before Christ: it means the Spirit, as described in
Gal. 5.16-25. Incidentally, the phrase serves to relativize 'law,' implyin
g that the Jewish law is just one form of law and not the highest.