בָּעֵ֣ת הַהִ֔יא בִּרְא֤וֹת דָּוִיד֙ כִּי־עָנָ֣הוּ יְהוָ֔ה בְּגֹ֖רֶן אָרְנָ֣ן הַיְבוּסִ֑י וַיִּזְבַּ֖ח שָֽׁם׃
At that time, when David saw that the LORD had answered him in the threshing-floor of Ornan the Jebusite, then he sacrificed there.
Related passages and parallel verses for I Chronicles 21:28.