Change of priesthood ....
changed from Levi lineage back to Melchizedek version by inspiration... which is the same thing as saying from Moses back to Abraham. ...
The laws themselves don't really change... the necessity of the priesthood branch changed because of the temple is not on earth but the services are now performed in the heavenly sanctuary with Yeshua officiating. So the word "change" doesn't mean void. . Its value in the daily services is decreased... Just like John the Baptist stated that his vocation in God's services must diminish because something better has come.
Eze 5:11 Wherefore,
as I live, saith the Lord GOD; Surely, because thou hast defiled my sanctuary with all thy detestable things, and with all thine abominations, therefore will I also diminish
thee; neither shall mine eye spare, neither will I have any pity.
On the note regarding Yeshua saying all "foods" clean... First "foods" are all the kosher variety or they would not be considered "food". Second you can not present the argument final answer if you don't present the situation in which is answered.
Mar 7:2 And when they saw some of his disciples eat bread with
defiled, that is to say, with unwashen, hands, they found fault.
3 For the Pharisees, and all the Jews, except they wash
their hands oft, eat not, holding the tradition of the elders.
4 And
when they come from the market, except they wash, they eat not. And many other things there be, which they have received to hold,
as the washing of cups, and pots, brasen vessels, and of tables. 5 Then the Pharisees and scribes asked him,
Why walk not thy disciples according to the tradition of the elders, but eat bread with unwashen hands?