So God informed Moses, Moses passed the word on to Aaron, Aaron, in turn, passed on the Word of God to the leaders of Israel, who in turn passed on the Word of God to the people that they were responsible to; that is, the Israelites did. Do you see how it is being passed? The Word of God, on which faith is based, which contains the evidence of what God is going to do, of what God is. It does not always say how He is going to do it, it just says that He is going to do this, and that and the other thing. But He wants us to use that evidence to act. Now in this case, the people believed, they responded, and put things to work.