Chasidut for Shabbat 298:2
אי הכי בניו ובני ביתו נמי בניו ובני ביתו היינו טעמא כדרב יהודה אמר רב דאמר רב יהודה אמר רב מותר להלוות בניו ובני ביתו ברבית כדי להטעימן טעם רבית
If so, the same applies to his sons and household? — As for his sons and household, this is the reason, as Rab Judah [said] in Rab's name. For Rab Judah said in Rab's name: One may lend to his sons and household on interest, in order to give them experience thereof.<span class="x" onmousemove="('comment',' Lit., 'to let them know the taste of usury', i.e., the grief and anxiety it causes. ');"><sup>3</sup></span> If so, a large portion [set off] against a small portion [should be permitted] too? — That indeed is so, and there is a lacuna, while it is thus taught: 'A MAN MAY CAST LOTS FOR HIS SONS AND HOUSEHOLD FOR THE TABLE, even [setting] a large portion against a small portion'. What is the reason? — As Rab Judah['s dictum] in Rab's name. Yet only for his sons and household, but not for strangers. What is the reason? — As Rab Judah['s dictum] in Samuel's name. [Further, 'setting] A LARGE PORTION AGAINST A SMALL PORTION is forbidden even on weekdays in the case of strangers'. What is the reason? — On account of gambling.<span class="x" onmousemove="('comment',' Which this resembles. ');"><sup>4</sup></span>