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

If thy brother constrained by poverty, sell himself to thee: thou shalt not oppress him with the service of bondservants.

But he shall be as a hireling, and a sojourner: he shall work with thee until the year of the jubilee.

And by right of inheritance shall leave them to your posterity, and shall possess them for ever. But oppress not your brethren the children of Israel by might.