Negative commandment · Lo Ta’aseh #255 of 613
Not to wrong such a servant
שלא להונות עבד זה
The verse · Devarim 23:17
עִמְּךָ יֵשֵׁב בְּקִרְבְּךָ בַּמָּקוֹם אֲשֶׁר־יִבְחַר בְּאַחַד שְׁעָרֶיךָ בַּטּוֹב לוֹ לֹא תּוֹנֶנּוּ
“he shall dwell with thee, among you, in that place which he shall choose in one of thy gates, where it likes him best: thou shalt not oppress him.”
The Rambam’s words
Not to wrong such a servant, as [Deuteronomy 23:17] states: "He shall dwell in your midst, in the place which he selects... as he sees fit. Do not wrong him."
שלא להונות עבד זה, שנאמר "עִמְּךָ יֵשֵׁב בְּקִרְבֶּךָ... בַּטּוֹב לוֹ לֹא תּוֹנֶנּוּ" (דברים כג, יז).
Who & when
“And this prohibition not to oppress the slave that fled from his master to the Holy Land is practiced by males and females at all times.”
Where in the Mishneh Torah
Hilchot Slaves הלכות עבדים