Reference for Bava Kamma 217:3

אמאי נמחליה לנפשיה מי לא תנן מחל לו על הקרן ולא מחל לו על החומש אלמא בר מחילה הוא

[BUT THE PORTION] WILL BE TRANSFERRED TO HIS FATHER'S [OTHER] CHILDREN OR TO HIS [FATHER'S] BROTHERS; IF THE SON HAS NOTHING [FOR A LIVELIHOOD], HE MAY BORROW [FROM OTHERS AN AMOUNT EQUAL TO HIS PORTION IN THE INHERITANCE] AND THE CREDITORS CAN COME AND DEMAND PAYMENT [OUT OF THE ESTATE].

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