'On that Day' in the Bible

Then David said on that day, “Whoever strikes the Jebusites, let him go up through the [underground] water shaft to strike the lame and the blind, who are detested by David’s soul [because of their arrogance].” So [for that reason] they say, “The blind or the lame (Jebusites) shall not come into the [royal] house [of Israel].”