Exodus 16:29

26 For six days you will get it, but on the seventh day, the Sabbath, there will not be any.

27 But still on the seventh day some of the people went out to get it, and there was not any.

28 And the Lord said to Moses, How long will you go against my orders and my laws?

29 See, because the Lord has given you the Sabbath, he gives you on the sixth day bread enough for two days; let every man keep where he is; let no man go out of his place on the seventh day.

30 So the people took their rest on the seventh day.

31 And this bread was named manna by Israel: it was white, like a grain seed, and its taste was like cakes made with honey.

32 And Moses said, This is the order which the Lord has given: Let one omer of it be kept for future generations, so that they may see the bread which I gave you for your food in the waste land, when I took you out from the land of Egypt.