Moses said, “This is what the LORD has commanded: ‘Keep an omer of manna for the generations to come, so that they may see the bread I fed you in the wilderness when I brought you out of the land of Egypt.’”
32. And Moses said. Moses does not proceed with the history in order, but by interposing these circumstances by anticipation, he the more confirms the fact that this food was then created for the people by God’s special bounty, because He desired an omer of it to be preserved as a memorial, which, undergoing no putrefaction, handed down to posterity the gloriousness of the miracle.
An omer of manna laid up in a golden pot before the ark was a standing miracle, meant to silence every murmur. Posterity would see what sort of food sustained them, and judge whether they had cause to complain or reason to thank God; eaten bread must not be forgotten. The manna never failed them forty years, though Israel was provoking, thus God's providence is constant, and Christ Himself is the true manna, the bread of life.
AI summary
Commenting on Exodus 16:32-36
As the Lord commanded Moses, so Aaron laid it up before the testimony, to be kept. That is, before the ark of the testimony; when that was made, as it was in a little time after this, called the testimony, because it contained in it the law, which was a testimony or testification of the mind and will of God unto Israel, see Exo 25:16...