Hebrews explicitly interprets the annual high-priestly inner-sanctuary entry and contrasts it with Christ's once-for-all access, drawing centrally on the Day of Atonement system. The annual calendar command and the ritual of Leviticus 16 together supply the background for Hebrews’ contrast between repeated restricted entry and Christ’s decisive access.

Leviticus 16 gives the detailed annual Day of Atonement ritual, including inner-sanctuary access, blood rites, confession, and cleansing. Leviticus 23 returns to the same day from the calendar side, specifying its date, holy convocation, self-affliction, and Sabbath rest. The two chapters describe one observance from complementary angles.

Acts 3:23 combines Moses’ prophet warning with “cut off/destroyed from among the people” covenant-sanction language that closely matches Leviticus 23:29. The Mosaic quotation is explicit, while the Leviticus contribution is best classified as a probable composite-scriptural echo rather than an announced quotation of Leviticus.

Foreshadowing / mirroring — strong canonical trajectory: Colossians 2:16–17 names festival, new-moon, and Sabbath observances as “a shadow of things to come” and says the substance/body belongs to Christ. Leviticus 23 is a central Torah calendar of appointed times, so Paul gives explicit Christ-directed shadow language at the system level even though he does not quote Leviticus 23 by name.