Halakhah zu Dewarim 23:17

To not oppress a slave who has fled to us, from outside the Land, to the Land [of Israel]: That we have been prevented, that we not oppress the slave that flees to us from outside of the Land. And about this does it state (Deuteronomy 23:17), "He shall live with you in any place he may choose among the settlements in your midst, wherever he pleases; you must not oppress him." And the language of Sifrei is "'You must not oppress him' - that is verbal oppression" - meaning to say, that we not curse him or disgrace him with words; and all the more so with actions.