“Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill”

I would argue that the verse where he said I am here to fulfill the old testament is more proving that christians should follow the old testament. There is not much in bible canon to suggest the old testament was vetod by Jesus, I would say there’s more than enough evidence in bible canon that old testament rules still apply to all christians.