in despoiling of the body of the flesh, but in the
circumcision of Christ, buried with Him in Baptism."

As to the sabbath, which was a sign recalling the first creation, its
place is taken by the "Lord's Day," which recalls the beginning of
the new creature in the Resurrection of Christ. In like manner other
solemnities of the Old Law are supplanted by new solemnities: because
the blessings vouchsafed to that people, foreshadowed the favors
granted us by Christ. Hence the feast of the Passover gave place to
the feast of Christ's Passion and Resurrection: the feast of
Pentecost when the Old Law was given, to the feast of Pentecost on
which was given the Law of the living spirit: the feast of the New
Moon, to Lady Day, when appeared the first rays of the sun, i.e.
Christ, by the fulness of grace: the feast of Trumpets, to the feasts
of the Apostles: the feast of Expiation, to the feasts of Martyrs and
Confessors: the feast of Tabernacles, to the feast of the Church
Dedication: the feast of the Assembly and Collection, to feast of the
Angels, or else to the feast of All Hallows.
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FOURTH ARTICLE [I-II, Q. 103, Art. 4]

Whether Since Christ's Passion the Legal Ceremonies Can Be Observed
Without Committing Mortal Sin?

Objection 1: It would seem that since Christ's Passion the legal
ceremonies can be observed without committing mortal sin. For we must
not believe that the apostles committed mortal sin after receiving
the Holy Ghost: since by His fulness they were "endued with power
from on high" (Luke 24:49). But the apostles observed the legal
ceremonies after the coming of the Holy Ghost: for it is stated (Acts
16:3) that Paul circumcised Timothy: and (Acts 21:26) that Paul, at
the advice of James, "took the men, and . . . being purified with
them, entered into the temple, giving notice of the accomplishment of
the days of purification, until an oblation should be offered for
every one of them." Therefore the legal ceremonies can be observed
since the Passion of Christ without mortal sin.

Obj. 2: Further, one of the legal ceremonies consisted in shunning
the fellowship of Gentiles. But the first Pastor of the Church
complied with this observance; for it is stated (Gal. 2:12) that,
"when" certain men "had come" to Antioch, Peter "withdrew and
separated himself" from the Gentiles. Therefore the legal ceremonies
can be observed since Christ's Passion without committing mortal sin.

Obj. 3: F