Reference for Arakhin 35:41

(ויקרא כז, יב) כערכך (כן) יקום אינו נותן אלא בזמן הערך:

WHAT! BECAUSE [THE TORAH] HAS RECKONED THE SIXTIETH YEAR TO BE UNDER THIS AGE, THEREBY BEING MORE STRINGENT, SHALL THE FIFTH OR THE TWENTIETH YEAR BE CONSIDERED UNDER THIS AGE.

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