What does Exodus 16:30 mean?

On the seventh day, some of the people went out to gather, and they found none.

Yahweh said to Moses, “How long do you refuse to keep my commandments and my laws?

Behold, because Yahweh has given you the Sabbath, therefore he gives you on the sixth day the bread of two days. Everyone stay in his place. Let no one go out of his place on the seventh day.”

The house of Israel called its name Manna, and it was like coriander seed, white; and its taste was like wafers with honey.

Moses said, “This is the thing which Yahweh has commanded, ‘Let an omer-full of it be kept throughout your generations, that they may see the bread with which I fed you in the wilderness, when I brought you out of the land of Egypt.’”

Moses said to Aaron, “Take a pot, and put an omer-full of manna in it, and lay it up before Yahweh, to be kept throughout your generations.”