Exodus 16:26-28

Young's Literal Translation

²⁶ six days ye do gather it, and in the seventh day -- the sabbath -- in it there is none.'

²⁷ And it cometh to pass on the seventh day, some of the people have gone out to gather, and have not found.

²⁸ And Jehovah saith unto Moses, `How long have ye refused to keep My commands, and My laws?