Leviticus 23:29

For whatsoever soul [it be] that shall not be afflicted in
that same day
That is, as the Targums of Jonathan and Jerusalem explain it, which can fast and does not fast; for a sick person, and a child under nine years of age, were not obliged to fast on this day {p}:

he shall be cut off from among his people;
by an untimely death, by the hand of God; the Targum of Jonathan says, by the pestilence.

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FOOTNOTES:

F16 Maimon. Hilchot Shebitat Ashur, c. 2. sect. 8, 10.