Reference for Arakhin 28:2

(ויקרא כז, כב) אם את שדה מקנתו אשר לא משדה אחוזתו שדה שאינה שדה אחוזה

Now according to R'Judah and R'Simeon, even if he dedicated it and his father died subsequently, it is still considered a field of possession.

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