Reference for Arakhin 47:36

קדושה ונותן חמשים ושמואל אמר

One cannot consecrate and then redeem at a deduction less than two years [before the year of Jubilee], and since one cannot consecrate to redeem at any reduction within less than two years, let a man be careful with his possessions and let him not consecrate anything within less than two years [of the Jubilee year].

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