פירוש על שמות 16:5

והיה משנה AND IT SHALL BE DOUBLE — for today and for tomorrow.

והכינו את אשר, even after having prepared the food from the raw manna it will still be twice the quantity it had been on the previous days. It will not shrink in the course of preparation. The reason G’d speaks of והכינו, “they will prepare it,” is to encourage the people to prepare for the Sabbath by observing it with delicacies, especially tasty food. They should concentrate on all this on the Sabbath eve.

והכינו את אשר יביאו, "and they shall prepare that which they shall bring in, etc." The "bringing of the manna into the camp was in itself part of the process called "preparation." They had to do this on Friday so as not to violate the Sabbath by bringing the manna into the camp on that day. This is why Moses phrased the Sabbath legislation as including: "let no one go outside his place" (i.e. the camp, verse 29).