Exodus 16:26

וביום השביעי שבת means but on the seventh day is a day of rest (supply the word הוא); and לא יהיה בו means the Manna shall not be on it; and this verse comes (is written) only to include the Day of Atonement and the Festivals [as being also days when no Manna would fall] (Mekhilta).

שֵׁ֥שֶׁת יָמִ֖ים תִּלְקְטֻ֑הוּ וּבַיּ֧וֹם הַשְּׁבִיעִ֛י שַׁבָּ֖ת לֹ֥א יִֽהְיֶה־בּֽוֹ׃

Six days you shall gather it; but on the seventh day, which is the sabbath, on it there shall be none.