I can't see that Jesus Christ saying that he came to fulfill the law and the prophets was doing away with those things, but still is something more said from God's word to show that really is meant, instead of the fulfillment from Christ providing for judgment to be diverted from the redeemed, who are saved through Christ? They are to repent, and so be saved from sin, and there is still the morality to live by that many don't do.
Yahweh shows his grace, love, and compassion for us, not wanting any to perish, but all were to come to repentance, with salvation made available through Christ. With this we are not going to be left with facing the fair judgment for our failures to live as we should, shown in what God said. Repenting with Christ living with us is with enabling us, and we are to turn to then live as we should, being led and guided for that, in obedience, and the good we should do is to come from that. It is not the same as being saved with doing those good things, because any good we do does not cover the bad things we have been doing. The real good that we would come to do shows the grace, love, and compassion that we know from God, and which we need, and which we share with others with whom we have anything to do. If we say love fulfills everything and yet are not actually showing love, then evidently there is not fulfillment of anything, and if there was, things that should have been done, with loving Yahweh God in response to him, will be done.
Isaiah 56 speaks of grace from Yahweh which will reach Israel and way more than Israel. All, the remnant of Israel and the others who were foreign and join in obedience, would be brought to God's holy mountain, to be made joyful in his house of prayer. This is where the wolf dwells with the lamb, the leopard with the young goat, the calf and the young lion and the fatling together with the little child, the cow and the bear grazing together with their young, the lion having straw with the ox, the nursing child safely by the cobra's hole, and no hurt or killing ever. That has not really happened yet, it is in the future. Who will those who are brought be? All of them, people of Israel and those of foreigners, are who join themselves to Yahweh to serve him and love his name, and keep from defiling the Sabbath, they are blessed for keeping justice and doing righteousness, keeping from doing any evil, even anything hurtful to others, this is being said.
And in response to the post about the body prepared for Yahweh, the heavenly Father and Logos who came as Christ the Son are in union together, being Yahweh. Christ the Son was the incarnation, with the union the Father was in him and he was in the Father. There was always the union, save evidently in the crucifixion for the atonement, where Christ was cut off, feeling forsaken. The cost was greater than what we can know, for us. We can only respond to him, knowing we should change our lives, without reserve, for him, may he indeed lead us.