...However, the sacrifice of the Mass is not a new offering for sin but a participation anew in Christ’s one Sacrifice of Calvary that culminated in everlasting glory in the heavenly sanctuary.
Consider the larger context of Hebrews 10:11-18 (ealgeone wrote a larger context so that’s better...)
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Here [in Heb 10:9-18] the author of Hebrews compares the sacrifices of Old Covenant priests, which had to be offered repeatedly, with the one sacrifice of Christ. Some of these Old sacrifices were offered daily (Heb. 10:11), and some less frequently, like the annual Passover and Yom Kippur/Day of Atonement sacrifices. The author of Hebrews makes the argument that Jesus fulfills the Day of Atonement sacrifices in Hebrews 9, especially verses 11-14.
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).
So Jesus is the high priest of heaven (CCC 662-64, 1137-39), and he always lives to make intercession for us. The Sacrifice of the Mass is our participation anew in Christ’s one continuing sacrifice, through which he always lives to make intercession for us (Heb. 7:23-25). This mean that the eucharistic sacrifice has continuing atoning power for the sins we commit daily (CCC 1366).
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, Heb. 5:7-10, Matt. 26:26-29, Luke 22:19-20; see CCC 1333, 1355, 1544). Consequently, the words of the Lord’s Prayer—“Thy kingdom come, thy will be done, on earth as it is in heaven”—are nowhere more profoundly fulfilled than in the Mass, because heaven and earth are united in a most perfect way that further fosters the redemption of mankind.
For more information on the intimate connection between the heavenly liturgy and the sacrifice of the Mass, see Pope Paul VI, Credo of the People of God, 24-26).
Source: https://www.catholic.com/qa/why-the-mass-when-theres-no-need-for-sin-offering
For context,you really have to look at the whole Epistle to the Hebrews, and the connection both with Abraham/Melchizedek and Malachi 1:11 -- the "pure" offering "from the rising to the setting of the sun" to be offered in future time "among the Gentiles". Hm. What would that be?
All of this is so beautiful and so meaningful.
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: