Nobody participated in Jesus Christ's sacrifice to begin with, except for those who crucified him...Where do you get that you now participate in his once for all sacrifice???
Because Christ’s one sacrifice culminated in everlasting glory, he continues to offer it in the heavenly sanctuary on our behalf (Heb. 8:1-3). That’s why he holds his priesthood permanently (Heb. 7:23-25), even now interceding on our behalf (Heb. 9:23-24).
Not according to the scriptures...
Heb 7:27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
Bible says Jesus doesn't need to be sacrifice daily for any Catholic's sins...He did it once, and that covered everyone for all time...
Because Christ’s one sacrifice culminated in everlasting glory, he continues to offer it in the heavenly sanctuary on our behalf (Heb. 8:1-3).
That's NOT what the verse says...
Heb 8:3 For every high priest is ordained to offer gifts and sacrifices: wherefore it is of necessity that this man have somewhat also to offer.
Heb 8:4 For if he were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law:
The reference is to Jesus being a high priest in heaven comparing him to priests in the Jewish priesthood...They offered gifts and blood...The verse says Jesus also as a high priest needed to offer something as well...
There is nothing at all that hints that Jesus would become a sacrifice again or that he continues to offer his once sacrifice for all continually...It's not there...
So what does the high priest offer??? He offers a gift...And what is the gift??? All you had to do to know is to read the scripture instead of posting a script from you Catholic apologists...
The gift is not a continual sacrifice...The gift is a new covenant...
Heb 8:6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
Heb 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
Heb 8:10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
Heb 8:11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
Heb 8:12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
Jesus’ one sacrifice is made sacramentally present and offered anew at every Mass according to the order of Melchizedek, i.e., under the forms of bread and wine (Gen. 14:18-20
Melchizedek didn't have anything to do with any Mass...Melchizedek gave Abram and his hungry and thirsty men some bread and wine and blessed them...
Gen 14:17 And the king of Sodom went out to meet him after his return from the slaughter of Chedorlaomer, and of the kings that were with him, at the valley of Shaveh, which is the king's dale.
Gen 14:18 And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God.
Gen 14:19 And he blessed him, and said, Blessed be Abram of the most high God, possessor of heaven and earth:
“Nobody participated in Jesus Christ’s sacrifice to begin with, except for those who crucified him...Where do you get that you now participate in his once for all sacrifice???
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That's a rather odd question, since we all, in a way, put Jesus on that cross. So in that sense, we all "participated" in the crucifixion 2,000 years ago. But to answer your question more directly, and to the heart of your question, where "we" (Catholics) get that we can and do participate in the one sacrifice is from the same article I linked to before. Let me restate, just using my own words but not saying anything new or different than what I posted before:
Jesus was and is a high priest, who holds his office forever. (Heb 7:23-24)
High priests must offer sacrifices, to be high priests (Heb 8:3)
Jesus is eternally interceding for us in front of the Father (Heb 9:24) (note, you didn't even address this key verse in your reply to me)
Jesus isn't "re-sacrificing" himself, (Heb 9:25) therefore we aren't either, when we participate in that same one sacrifice.
Conclusion: Jesus is a high preist, high priests offer sacrifices, Jesus is interceding for us even now in front of the Father, therefore since he is a high priest, who must offer sacrifices to be priests, and interceding for us, ipso facto, He must be offering a continual sacrifice to the Father, and what is this sacrifice He must be offering? It's His one sacrifice described in Heb 10:10. Because again, he isn't re-sacrificing Himself, we know that.
It can't be this "new covenant" you seem to claim, because a "covenant" is not, by definition, a "sacrifice". It is often ratified *by* a sacrifice, but is itself not a sacrifice.
Therefore, He must be offering his one complete and infinitely holy sacrifice, before the Father. And again, must be doing so continually because He is interceding for us continually.
So that's where we "get" that we can participate in His one sacrifice, at least in an eternal sense because His sacrifice is eternal (in Heaven, where Jesus is offering His one sacrifice to the Father, there is no time). It's not "once and done" it's "once for all", meaning one sacrifice for all people. Not all people accept the gift of His grace in His sacrifice of course, that's why not all are saved, but my point here is that Heb 10:10 isn't saying "once and done", the word "done" does not appear in that verse.
It's "once for all". It's you, and others, who read into the text and insist that phrase must mean "once and done", as in one time in time, but it was once in time, but an eternal sacrifice, otherwise He would have nothing to offer the Father when He intercedes for us in eternity. The fact that later, in Heb 10:12 it says He now "[sits] down at the right hand of God..." is not relevant to this point because He both clearly "sits at the right hand of God" (10:12) but also "appears in the presence of God on our behalf" (9:24). So He's doing both things, at His Father's right hand waiting for His enemies to be put under His feet, but also appears on our behalf continually before the Father, even now. (Heb 10:14) He's God, he can walk and chew gum at the same time.
Of course, there's the factor of "transubstantiation" to consider in this question of yours, because that is the other part of how we can participate in it now, but I'm not even going there, because I'm tired already.
The last word is yours; I'm not going to respond not for lack of an answer to anything else you may ask or say, but because there is nothing left to be said on this point, for those with eyes to see.