Cubit

The cubit is the standard measure that runs through scripture's accounts of building, sizing, and gauging — from the ark that survives the flood, through the tabernacle furnishings and a giant's iron bedstead, to the prophetic temple and the wall of the new Jerusalem. A late saying transposes the unit out of carpentry and architecture and into anxious human reckoning about the length of a life.

The Unit and Its Standard

The cubit's reference point is the human forearm, and Deuteronomy fixes that standard explicitly. When Og king of Bashan's iron bedstead is described, its dimensions are reported "after the cubit of a man" (Deut 3:11). The same verse uses the unit twice over: "Nine cubits was its length, and four cubits the width of it, after the cubit of a man." The aside is the closest thing in the Hebrew narrative to a footnote on what the word means — the cubit is the man-cubit, the human-forearm measure.

Ezekiel's vision of the temple introduces a refined version of the same unit. The measuring man in his hand carries "a measuring reed six cubits long, of a cubit and a handbreadth each" (Ezek 40:5). The altar is then sized by the longer cubit explicitly: "the measures of the altar by cubits (the cubit is a cubit and a handbreadth)" (Ezek 43:13). The temple-cubit, in other words, is the ordinary cubit plus a handbreadth — a deliberately marked, sacral version of the man-keyed unit.

Sizing the Ark and the Sanctuary

Cubits first appear as the unit by which Yahweh's command sizes the ark. In the directive to Noah, the upward closing of the vessel is fixed at this measure: "to a cubit you will finish it upward; and the door of the ark you will set in its side; with lower, second, and third stories you will make it" (Gen 6:16). The ark is to be capped off at the span of one cubit above.

The same unit governs the construction of the ark of the covenant. Bezalel's execution-report is given in cubit dimensions on all three axes: "two cubits and a half was the length of it, and a cubit and a half the width of it, and a cubit and a half the height of it" (Exod 37:1). The sanctuary chest is sized by the same unit that closes the flood-ark.

The Giant's Bedstead

Between the patriarchal and tabernacle uses of the cubit and its later prophetic and apocalyptic ones, Deuteronomy preserves a curiosity. Og of Bashan, last of the Rephaim, leaves behind a bedstead of iron, "Nine cubits was its length, and four cubits the width of it, after the cubit of a man" (Deut 3:11). The dimensions are given in ordinary man-cubits, not in any longer or specialized unit, and the size of the bed is what testifies to the size of the king.

The Temple and the Altar

Ezekiel's tour of the visionary temple is conducted with cubits as the measuring vocabulary throughout. The first measurement is of the outer wall: "a measuring reed six cubits long, of a cubit and a handbreadth each: so he measured the thickness of the building, one reed; and the height, one reed" (Ezek 40:5). The wall, then, is six long-cubits thick and six long-cubits high.

The altar of Ezekiel 43 is sized by the same elongated cubit: "And these are the measures of the altar by cubits (the cubit is a cubit and a handbreadth): And a hole of one cubit and the width a cubit, and its border by its edge round about a span; and this will be the base of the altar" (Ezek 43:13). The base is laid out in single cubits, with a span — a half-cubit, a hand's spread — for the border.

The Measure of the New Jerusalem

The unit reappears at the end of the canon as the measure of the descended city's wall. The angelic measurer applies the cubit to the wall, and the report is given with a clarifying clause: "And he measured her wall, a hundred and forty and four cubits, [according to] the measure of a man, that is, of an angel" (Rev 21:17). The wall is sized at 144 cubits by the man-and-angel-keyed standard; the unit is again the human-forearm measure, but here it is also the angel's measure, the two scales identified.

The Cubit and Human Stature

The last canonical use of the unit moves it out of building entirely. In the discourse against anxiety, the cubit becomes the smallest imaginable increment a person might wish to add to his own life and cannot: "And which of you⁺ by being anxious can add a cubit to the measure of his life?" (Luke 12:25). The unit by which the ark, the tabernacle's chest, the giant's bedstead, the prophetic temple, and the new Jerusalem are sized is the same unit the worried hearer cannot add to himself.