Exodus 16:23

And Mosheh said to them, This which the Lord hath told you, do. Tomorrow is the rest of the holy Sabbath before the Lord: That which is needful to have to bake for tomorrow, bake today; and what is needful to boil for tomorrow, boil today: and all whatever remaineth of that which on eat today lay it up, and it shall be preserved until the morning.

And He spoke: God had already told me that you are obligated to rest tomorrow, that you not do work - even [preparation of] food for oneself...

BAKE THAT WHICH YE WILL BAKE. Rashi explained: “Whatever you wish to bake in the oven or boil in water, bake and boil today — all [that you require] for two days.” If so, the purport of the verse is as follows: “That which you would bake of the two omers you have, bake today, and that which you would boil of the two omers, boil now, and all that remaineth for you after eating to the full today, lay up for you to be kept until the morning.” In the morning [of the Sabbath-day], when the Israelites saw that it did not spoil, they came before Moses, since they did not want to eat the manna of yesterday even though Moses had permitted it to be kept until the morning. Then Moses permitted them to eat it on that Sabbath-day only “because it was for that purpose of which I said to keep it for a charge.” He further informed them of the reason of the commandment, for today ye shall not find it in the field, since G-d does it so because it is a holy Sabbath unto the Eternal. It is possible that by saying and all that remaineth over, He did not set any measure for that. Rather, they could eat at will on the sixth day, as the remainder would suffice for the Sabbath, because it is the blessing of the Eternal.
And Rabbi Abraham ibn Ezra explained: “That which you would bake ordinarily — namely, the [daily] omer known to you — bake for your use today; and all that remaineth, namely, the second omer, lay up for you to be kept until the morning. At that time, Moses did not tell them what to do with the second omer. It was on the following morning [the Sabbath], that he told them, eat that today.” But if so, they ate the manna on the Sabbath raw, without baking it or seething it in pots and making cakes of it as it was their custom to do. The first interpretation, [that of Rashi], is more correct, and so is the opinion of Onkelos. (intend), Onkelos intimated his understanding of the verse to be similar to that of Rashi: “that which you intend baking of the two omers, bake today, etc.” This is unlike the explanation of Ibn Ezra, who interpreted the verse as meaning: “that which you would bake ordinarily — [i.e., one omer] — bake today, and the other omer leave over till the morning,” thus resulting in their eating the omer on the Sabbath in an unprepared state.

'ויאמר אליהם הוא אשר דבר ה, already on the first day, but I did not tell you about it. Moses had deliberately waited until they would express their amazement at the phenomenon of a double portion on Friday in order to be able to explain to them that this was all in honour of the forthcoming Sabbath.

אפו, actually, the letter א in אפו should have been written with a chataf segol just as in אכל, echol, from the root אכל, or emor, from the root אמר. This would have been a normal imperative mode. However, seeing that the tone-sign does not link it to the word following, this resulted in the vowel tzeyre, a longer sounding vowel, instead of the chataf segol we would have expected. I have not really found any other parallel of this construction in the Bible other than the word heyvu in Hoseah 4,18 אהבו הבו קלון מגיניה , “they love beyond measure-disgrace is the gift.”[a reproof to the priests who demanded too much from the people. Ed.]

את אשר תאפו, the portion of each day’s ration which they would bake in an oven. The subject has been referred to again in Numbers 11,8 as ועשו אותו עוגות “they would make it into cakes.”

אפו!, now, on the Sabbath eve.

ואת אשר תבשלו, and the portion of it which you want to prepare boiled, parallel to what is described in the corresponding chapter in Numbers as ובשלו בפרד, “they boiled it in a pot.”