1 Chronicles 21:20

“Ornan was threshing wheat--If the census was entered upon in autumn, the beginning of the civil year, the nine and a half months it occupied would end at wheat harvest. The common way of threshing corn is by spreading it out on a high level area, and driving backwards and forwards upon it two oxen harnessed to a clumsy sledge with three rollers and some sharp spikes. The driver sits on his knees on the box, while another person is employed in drawing back the straw and separating it from the grain underneath. By this operation the chaff is very much chopped, and the grain threshed out.”

“Hid themselves - Because of the glory and majesty in which the angel appeared, which mens weak natures are not able to bear; and from the fear of God's vengeance which now seemed to be coming to their family. 1 Chronicles 21:25”

“And Ornan: etc. or, When Ornan turned back and saw the angel, then he, and his four sons with him, hid themselves. Jdg 6:11 1 Chronicles 21:21”

“ארנן ויּשׁב, "and Ornan turned him about," is translated by Berth. incorrectly, "then Ornan turned back," who then builds on this erroneous interpretation, which is contrary to the context, a whole nest of conjectures. ויּשׁב is said to have arisen out of ויּשׁקף, the succeeding המּלאך out of המּלך, עמּו בּניו ערבּעת out of עליו עברים עבדיו ( Sa2 24:20), "by mistake and further alteration." In saying this, however, he himself has not perceived that Sa2 24:20 (Sam.) does not correspond to the Ch1 21:20 of the Chronicle at all, but to the Ch1 21:21, where the words, "and Araunah looked out (ישׁקף) and saw the king," as parallel to the words, "and Ornan looked (יבּט) and saw David." The Ch1…”