C. F. Keil and Franz Delitzsch on 2 Chronicles 4:1

2Ch 4:1 2Ch 4:1-6. The copper furniture of the court. 2Ch 4:1. The altar of burnt-offering. Its preparation is passed over in 1 Kings 6 and 7, so that there it is only mentioned incidentally in connection with the consecration of the temple, 1Ki 8:22, 1Ki 8:54, and 1Ki 9:25. It was twenty cubits square (long and broad) and ten cubits high, and constructed on the model of the Mosaic altar of burnt-offering, and probably of brass plates, which enclosed the inner core, consisting of earth and unhewn stones; and if we may judge from Ezekiel’s description, Eze 43:13-17, it rose in steps, as it were, so that at each step its extent was smaller; and the measurement of twenty cubits refers only to the lowest scale, while the space at the top, with the hearth, was only twelve cubits square; cf. my Bibl. Archaeol. i. S. 127, with the figure, plate iii. fig. 2.