Positive commandment · Mitzvat Aseh #142 of 613
To seek to collect [a debt] from a gentile [in the seventh year]
לנגוש לנוכרי
The verse · Devarim 15:3
אֶת־הַנׇּכְרִי תִּגֹּשׂ וַאֲשֶׁר יִהְיֶה לְךָ אֶת־אָחִיךָ תַּשְׁמֵט יָדֶךָ
“Of a foreigner thou mayst exact it again: but that which is thine with thy brother thy hand shall release.”
The Rambam’s words
To seek to collect [a debt] from a gentile [in the seventh year], as [Deuteronomy 15:3] states: "Seek to collect [a debt] from a gentile. However, what your brother owes you must remit...."
לנגוש לנוכרי, שנאמר: "את הנוכרי, תיגוש; ואשר יהיה לך" (דברים טו,ג).
Why · Sefer HaChinuch #476
Press the foreigner
“It is from the roots of the commandment [that it is] so that we not teach our souls to have pity and to have mercy upon them, so that we are not pulled after their deeds and their counsel in anything.”
Who & when
“And this commandment is practiced in every place and at all times by males and females.”
Where in the Mishneh Torah
Hilchot Creditor and Debtor הלכות מלווה ולווה