What law did Christ fulfill????
I would say ALL of them
Matt. 22:36 “Teacher, which is the greatest commandment in the Law?”
37 Jesus replied: “‘Love the Lord your God with all your heart and with all your soul and with all your mind.’£ 38 This is the first and greatest commandment. 39 And the second is like it: ‘Love your neighbor as yourself.’£ 40 All the Law and the Prophets hang on these two commandments.”
Christians do things and don't things because they love
Jesus NOT to keep the law.
Take a look at the Ten Commandments, Christ quoted the Ten Commandments because the first five are specifically about "Love the Lord your God with all your heart and with all your soul and with all your mind"!!!
Now check out the last five commandments and note they are specifically about "loving your neighbor as yourself". Now if the law is fulfilled then how is it possible to follow Christ's own instruction??? How much clearer can Christ's words be "All the LAW and the Prophets hang on these two commandments"????