Albert Barnes Commentary Ezekiel 43:14

"And from the bottom upon the ground to the lower ledge shall be two cubits, and the breadth one cubit; and from the lesser ledge to the greater ledge shall be four cubits, and the breadth a cubit." — Ezekiel 43:14 (ASV)

The bottom - The basement just described is now called “the bottom upon the ground.” The altar (independently of the bottom) was composed of two stages called “settles,” the base of the “upper settle” (M) being less than that of the “lower” (L).

To the lower settle - That is, to the top of “the lower settle,” which was to be “two cubits high.”

From the lesser settle ... to the greater settle - that is, from the top of the “lower settle” to the top of the “upper settle,” called “lesser” and “greater” because the height of the lower is less than that of the “upper”; “The breadth” here is the part of the lower settle not covered by the upper settle, projecting one cubit on every side.