Exodus 16:23

את אשר תאפו אפו THAT WHICH YOU WOULD BAKE, BAKE whatever you wish to bake (cf. Onkelos: די אתון עתידין למפא and Rashi on אז ישיר משה) in the oven bake to-day — all that you will need for two days; and what you require to boil of it in water boil to-day. The expression baking applies to bread, (cf. Rashi on Genesis 40:1) and the expression boiling to a cooked dish. למשמרת means as something put by (to be kept).

וַיֹּ֣אמֶר אֲלֵהֶ֗ם ה֚וּא אֲשֶׁ֣ר דִּבֶּ֣ר יְהֹוָ֔ה שַׁבָּת֧וֹן שַׁבַּת־קֹ֛דֶשׁ לַֽיהֹוָ֖ה מָחָ֑ר אֵ֣ת אֲשֶׁר־תֹּאפ֞וּ אֵפ֗וּ וְאֵ֤ת אֲשֶֽׁר־תְּבַשְּׁלוּ֙ בַּשֵּׁ֔לוּ וְאֵת֙ כׇּל־הָ֣עֹדֵ֔ף הַנִּ֧יחוּ לָכֶ֛ם לְמִשְׁמֶ֖רֶת עַד־הַבֹּֽקֶר׃

And he said to them, This is that which the Lord has said, Tomorrow is the rest of the holy sabbath to the Lord: bake that which you will bake today, and what you will boil, boil today; and that which remains over lay up for you to be kept until the morning.