Deuteronomy 23:15

Thou shalt not deliver unto his master the servant which is escaped from his master unto thee:

You shall not deliver to his master a servant who is escaped from his master to you:

Thou shalt not deliver unto his master a servant that is escaped from his master unto thee:

`Thou dost not shut up a servant unto his lord, who is delivered unto thee from his lord;

Do not return a slave to his master if he has taken refuge with you.