Yes the priesthood is not done away with, but there was only one change to the law and that was from the tribe of Levi to Judah, On the mount of transfiguration, with Moses and Elijah being present.
Malachi 3:6 (KJV) [SUP]
6 [/SUP]For I am the LORD, I change not; therefore ye sons of Jacob are not consumed.
Hebrews 13:8 (KJV)
[SUP]8 [/SUP]Jesus Christ the same yesterday, and to day, and for ever.
No other change was prophesied other than this.
Isaiah 65:8-9 (KJV)
[SUP]8 [/SUP]Thus saith the LORD, As the new wine is found in the cluster, and one saith, Destroy it not; for a blessing is in it: so will I do for my servants' sakes, that I may not destroy them all.
[SUP]9 [/SUP]And I will bring forth a seed out of Jacob, and out of Judah an inheritor of my mountains: and mine elect shall inherit it, and my servants shall dwell there.
I find no change of Passover in prophecy.
Then you ignore this...
Mat 26:26 And as they were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is my body.
Mat 26:27 And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it;
Mat 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
The Old Testament Passover did not include the broken body and the shed blood.
1Co 11:23 For I have received of the Lord that which also I delivered unto you,
That the Lord Jesus the same night in which he was betrayed took bread:
And we have seen from scripture that this was the night they ate the Passover, the night before His crucifixion and the night before the beginning of the Frist Day of Unleavened Bread.
1Co 11:24 And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
1Co 11:25 After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
So, if you see no change in the Passover, you reject the bread and wine and footwashing?
Joh 13:1 Now before the feast of the passover, when Jesus knew that his hour was come that he should depart out of this world unto the Father, having loved his own which were in the world, he loved them unto the end.
From Bullinger's...
John 13:1
Now. Not the same word as in Joh_12:27, Joh_12:31, expressing a point of time, but a particle (Greek. de) introducing a new subject.
before. Greek. pro. App-104. The preparation day, the 14th day of Nisan, our Tuesday sunset to Wednesday sunset, the day of the Crucifixion. See App-156,
Joh 13:2 And supper being ended, the devil having now put into the heart of Judas Iscariot, Simon's son, to betray him;
Joh 13:3 Jesus knowing that the Father had given all things into his hands, and that he was come from God, and went to God;
Joh 13:4 He riseth from supper, and laid aside his garments; and took a towel, and girded himself.
Joh 13:5 After that he poureth water into a bason, and began to wash the disciples' feet, and to wipe them with the towel wherewith he was girded.
Joh 13:6 Then cometh he to Simon Peter: and Peter saith unto him, Lord, dost thou wash my feet?
Joh 13:7 Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter.
Joh 13:8 Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.
Joh 13:9 Simon Peter saith unto him, Lord, not my feet only, but also my hands and my head.
Joh 13:10 Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all.
Joh 13:11 For he knew who should betray him; therefore said he, Ye are not all clean.
Joh 13:12 So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you?
Joh 13:13 Ye call me Master and Lord: and ye say well; for so I am.
Joh 13:14
If I then, your Lord and Master, have washed your feet; ye also ought to wash one another's feet.
Joh 13:15
For I have given you an example, that ye should do as I have done to you.
Joh 13:16 Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him.
Joh 13:17
If ye know these things, happy are ye if ye do them.
The foot washing service was not part of the Old Covenant Passover service, do you reject this also?