Exodus 13:10

Thou shall therefore keep the ordinance in his season
Not the ordinance of the phylacteries, as the Targum of Jonathan, but the ordinance of unleavened bread: from year to year;
every year successively, so long as in force, even unto the coming of the Messiah. It is in the Hebrew text, "from days to days" ^F3; that is, either year after year, as we understand it; or else the sense is, that the feast of unleavened bread, when the season was come for keeping it, was to be observed every day for seven days running.

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FOOTNOTES:

F3 (hmymy Mymym) "a diebus in dies", V. L. Montanus, Munster, Vatablus, Drusius.