Heb 7, 24 He has a priesthood that does not pass away

(Heb 7, 24) He has a priesthood that does not pass away
[24] but he, because he remains forever, has a priesthood that does not pass away.

(CCC 1356) If from the beginning Christians have celebrated the Eucharist and in a form whose substance has not changed despite the great diversity of times and liturgies, it is because we know ourselves to be bound by the command the Lord gave on the eve of his Passion: "Do this in remembrance of me" (1 Cor 11:24-25). (CCC 1357) We carry out this command of the Lord by celebrating the memorial of his sacrifice. In so doing, we offer to the Father what he has himself given us: the gifts of his creation, bread and wine which, by the power of the Holy Spirit and by the words of Christ, have become the body and blood of Christ. Christ is thus really and mysteriously made present. (CCC 1358) We must therefore consider the Eucharist as: - thanksgiving and praise to the Father; - the sacrificial memorial of Christ and his Body; - the presence of Christ by the power of his word and of his Spirit. (CCC 1366) The Eucharist is thus a sacrifice because it re-presents (makes present) the sacrifice of the cross, because it is its memorial and because it applies its fruit: [Christ], our Lord and God, was once and for all to offer himself to God the Father by his death on the altar of the cross, to accomplish there an everlasting redemption. But because his priesthood was not to end with his death, at the Last Supper "on the night when he was betrayed," [he wanted] to leave to his beloved spouse the Church a visible sacrifice (as the nature of man demands) by which the bloody sacrifice which he was to accomplish once for all on the cross would be re-presented, its memory perpetuated until the end of the world, and its salutary power be applied to the forgiveness of the sins we daily commit (Council of Trent (1562): DS 1740; cf. 1 Cor 11:23; Heb 7:24, 27).