"saying": They responded to an affirmative (i.e., "You shall, etc.") in the affirmative ("Yes") and to a negative, in the negative. R. Akiva says: to an affirmative in the affirmative, and to a negative in the affirmative. Variantly: "saying": Go and say to them (what I have told you) and return their reply to Me. And whence is it derived that He did so? From (Ibid. 19:8) "And Moses returned the words of the people to the L–rd." And whence is it derived that He acknowledged their words? From (Devarim 18:17) "They have done well in speaking as they did."