וַיָּ֣שָׁב אָרְנָ֗ן וַיַּרְא֙ אֶת־הַמַּלְאָ֔ךְ וְאַרְבַּ֧עַת בָּנָ֛יו עִמּ֖וֹ מִֽתְחַבְּאִ֑ים וְאָרְנָ֖ן דָּ֥שׁ חִטִּֽים׃
And Ornan turned back, and saw the angel; and his four sons that were with him hid themselves. Now Ornan was threshing wheat.
Read halakhic rulings (Jewish law) on I Chronicles 21:20: and classical halakhic sources.