a shadow: the dark shape or cool patch cast when something solid stands in the light, and by extension both deathly gloom and the advance outline of a reality still to come
Every use of this word rests on one physical fact: a shadow is thrown by something solid standing in the light. That is why the word can travel so far without breaking. The shade under a large plant, the shape a walking man casts across the sick, the gloom that hangs over people facing death, and the old religious order that anticipates something better are all shapes produced by something else.
The move that surprises modern readers is the last one. When Colossians and Hebrews call the festivals, the food rules, and the whole priestly service a shadow, they are not calling them fakes. A shadow is evidence that a body is present and casting it. So the argument runs two ways at once: the older arrangement is genuinely tied to what it points at, and it is never more than the outline. Hebrews sharpens this by setting the shadow against the actual likeness (εἰκών) of the realities, and against the copy built to a pattern (ὑπόδειγμα); Colossians sets it against the body that throws it.
The shadow in this word is also not the same thing as plain dark. Darkness (σκότος) is the absence of light anywhere; a shadow is a specific shape, with edges, produced by a specific object. Even the bleakest use keeps that shape, since people are pictured sitting in the shadow of death, as though death itself loomed over them and blocked out the light.
Nuances
Whether the "copy and shadow" language of Hebrews 8:5 (and the shadow of Hebrews 10:1) is spatial and Platonic, contrasting an earthly copy with an unchanging heavenly archetype, or temporal and eschatological, contrasting an anticipatory older order with the reality that has now arrived.
- majorityThe antithesis is fundamentally eschatological and salvation-historical: the shadow is cast forward in time by the coming reality, and the Platonic vocabulary is a borrowed idiom rather than an adopted metaphysics.; C. K. Barrett, "The Eschatology of the Epistle to the Hebrews," in The Background of the New Testament and Its Eschatology (Cambridge, 1956); L. D. Hurst, The Epistle to the Hebrews: Its Background of Thought, SNTSMS 65 (Cambridge, 1990); H. W. Attridge, Hebrews, Hermeneia (Fortress, 1989), on 8:5 and 10:1
- minorityThe antithesis reflects a genuinely Middle Platonic and Philonic conceptual world, in which the earthly cult is the shadowy image of an unchanging heavenly archetype.; C. Spicq, L'Épître aux Hébreux, Études bibliques (Gabalda, 1952); J. W. Thompson, The Beginnings of Christian Philosophy: The Epistle to the Hebrews, CBQMS 13 (CBA, 1982)