1 Kings 18:32

32. As great as would contain two measures of seed This means, according to Thenius and Keil, that the space taken up by the whole trench was as large as that on which two measures of grain would ordinarily be sown. But this would have made the trench enclose a space incredibly large. The measures here mentioned are in the Hebrew seahs, containing at the lowest estimate about six quarts, and twelve quarts of grain would be more than enough to sow over the entire level space of the summit of el-Mohrakah, which is about twenty rods square. It is better, therefore, to understand that the trench itself would hold about twelve quarts of grain or water. It was dug to catch and hold the water which Elijah proposed to pour over the altar, and thus to show the people that there was no secret way of letting it off. It needed no large trench to answer this purpose, and no deep trench could easily be dug in that rocky surface; but the shallow soil now on the rock would be sufficient for a trench capable of holding three gallons, and the soil may have been deeper in Elijah’s time. “I myself observed,” writes Professor Mead, ( Bibliotheca Sacra, 1873, p. 685,) “close to the Mohrakah, a rocky surface, artificially smoothed, about eight feet square, around the edge of which had been dug a groove an inch or two in depth. One might almost be tempted to find in that the foundation and trench of the very altar itself.”