Sifrei_mitzvot for Deuteronomy 23:16

לֹא־תַסְגִּ֥יר עֶ֖בֶד אֶל־אֲדֹנָ֑יו אֲשֶׁר־יִנָּצֵ֥ל אֵלֶ֖יךָ מֵעִ֥ם אֲדֹנָֽיו׃

Thou shalt not deliver unto his master a bondman that is escaped from his master unto thee;