Exodus 16:26

Six days ye shall gather it,.... Day after day, every morning, as they had done the six days past, so they should during their stay in the wilderness:

but on the seventh day, [which] is the sabbath; which is repeated, being a new thing, to impress it on their minds: in it there shall be none: no manna; none shall fall, and so none can be gathered, and therefore it would be to no purpose to go out and seek for it; as also there would be no need of it, since they would always have a double portion on the sixth day.