Scholarship on Legal query or responsum: T-S G1.20

Recto

1. What does our master and teacher, rabbi Yiṣḥaq [b. Sasson] the judge, the mighty hammer and the flag of the rabbis, may he live, say 
2. about a Jew who was in partnership with a non-Jew for some years who took the profit of the partnership (muʿāmala), keeping it 
3. from the Jew. Then, he wrote a document (ḥujja) against him, putting an end to 
4. his partnership. The Jew threatened to imprison him so as to force the non-Jew to give him back the amount he took.
5. The Jew gathered against him the old and the new debits and had them drawn up in a Jewish legal document (sheṭar) in a Jewish court (beit din),
6. mentioning the totality of the amounts. The Jew made a new complete calculation; the entirety of the partnership was thus contained in
7. the document.         Teach us, may his rock protect him, (1) whether if the non-Jew sues the Jew in the beit 
8. din and accuses him using the shetar as his documentation, it is permissible or not for the Jew to deny [the validity of] the shetar, (2) and [whether he can] oblige 
9. the non-Jew to take an oath swearing that he doesn’t owe the other person any additional money on account of the prohibition on interest (ribit) that he 
10. claims, (3) and whether a punishment (onesh) can be imposed on him or not on account of the oath, and whatever should be done on this question.
11. May his reward be doubled from heaven.