Exodus 16:23-36

...he said to them, “This is what the LORD has commanded: ‘Tomorrow is a day of solemn rest, a holy sabbath to the LORD; bake what you want to bake and boil what you want to boil, and all that is left over put aside to be kept until morning.’ ” So they put it aside until morning, as Moses commanded them; and it did not become foul, and there were no worms in it. Moses said, “Eat it today, for today is a sabbath to the LORD; today you will not find it in the field. Six days you shall gather it; but on the seventh day, which is a sabbath, there will be none.”

On the seventh day some of the people went out to gather, and they found none. The LORD said to Moses, “How long will you refuse to keep my commandments and instructions? See! The LORD has given you the sabbath, therefore on the sixth day he gives you food for two days; each of you stay where you are; do not leave your place on the seventh day.” So the people rested on the seventh day.

The house of Israel called it manna; it was like coriander seed, white, and the taste of it was like wafers made with honey. Moses said, “This is what the LORD has commanded: ‘Let an omer of it be kept throughout your generations, in order that they may see the food with which 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 an omer of manna in it, and place it before the LORD, to be kept throughout your generations.” As the LORD commanded Moses, so Aaron placed it before the covenant, for safekeeping. The Israelites ate manna forty years, until they came to a habitable land; they ate manna, until they came to the border of the land of Canaan. An omer is a tenth of an ephah.