Eruchin 9:3 - 9:4

הרי זה גאל מיד – and its law (i.e., of a house among houses in walled cities) is not like the law of an ancestral field which he does not redeem less than two years [after its sale].

הרי זה כמין ריבית – when he returns to him (i.e., the buyer) his money within a year and this one (i.e., the original seller) does not deduct from him anything, it is found that it was used in his house for the fee of the detaining of his money that certainly comes towards [collecting] interest, which is not permanently sold, but not through a sale for if he did not redeem it and it (i.e., the sale) becomes final, there is no interest charged.

יגאל בנו – [his son shall redeem it] within a year if he desires, but after a year, it is completely sold and it is not ever redeemed, as it is written (Leviticus 25:30): “If it is not redeemed before a complete year has elapsed, [the house in the walled city shall pass to the purchaser beyond reclaim throughout the ages; it shall not be released in the jubilee].”

משעה שמכר לו – that if Reuven sold it to Shimon in Nisan and Shimon [sold it] to Levi in Iyar, once Nisan arrived, it is permanently sold, and we don’t reckon to the second sale, but rather to the fist sale [only], as it is stated (Leviticus 25:30): “before a full year has elapsed,” for it implies to this one that it was his.

להביא חודש העיבור – for if it is a leap year (i.e., with an added month of Adar – seven times in every nineteen years), it is not completely sold until thirteen months [have passed].

שנה ועיבורה – whether it is a simple year or whether it is a leap year, we give him the lunar year which is three-hundred and fifty-four days and the eleven extra days that a solar year has over that of a lunar year that their intercalation we complement the year with. And the Halakha is according to the Sages.

ואחד הנותן במתנהn – if he wanted to redeem [the house] within its year, he can redeem, but if not, it is permanently sold to him.

היה נטמן (was hidden, hide oneself) – the purchaser on the [exact] day of twelve months in order that the seller not find him to give him [back] his money so that it will be permanently sold to him.

שהיא חולש – that he would put his monies in the chamber of that which is dedicated to sacred purposes in the Temple courtyard.

ויהא שובר את הדלת – of the house of that he sold and enter it. [The word] חולש / assign (his redeeming money to the Temple by depositing there , to assert his privilege of redemption) is like (Isaiah 14:12):”[How are you felled to earth,] O vanquisher of nations!”