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Если же поселится у тебя пришлец и захочет совершить Пасху Господу, то обрежь у него всех мужеского пола, и тогда пусть он приступит к совершению ее и будет как природный житель земли; а никакой необрезанный не должен есть ее;
Исход 12:48
Arcana Coelestia #7903
7903. 'Until the twenty-first day of the month' means the end of that holy [state]. This is clear from the meaning of 'the twenty-first day' as a holy state, and also as the end of that state. A holy state is meant because that number is the product of seven and three multiplied together, and 'seven' means what is holy, as also does 'three'. And the end of that state is plainly meant by that twenty-first day because it was the last.
