Bible Verses About Servants: When Israelites not to be treated with rigour

If a countryman among you becomes destitute and sells himself to you, then you must not force him into slave labor.

Let him stay with you as a hired worker or temporary resident; he is to work for you until the Year of Jubilee.

You may leave them to your sons after you to inherit as property; you can make them slaves for life. But as for your brothers, the Israelites, no man may rule harshly over his brother.