Exodus 16:29-33

See, the Lord has given you the Sabbath; for that reason He gives you bread for two days on the sixth day. Remain, everyone, in his place; no one is to leave his place on the seventh day.”

So the people rested on the seventh day.

And the house of Israel named the bread manna, and it was like coriander seed, white, and its taste was like wafers with honey.

Then Moses said, “This is what the Lord has commanded: ‘A full omer of it is to be kept safe throughout your generations, so that they may see the bread that I fed you in the wilderness, when I brought you out of the land of Egypt.’ ”

And Moses said to Aaron, “Take a jar and put a full omer of manna in it, and place it before the Lord to be kept safe throughout your generations.”