Deuteronomy 15:12-15

If one of your own people sells himself to you as a slave, whether it is a Hebrew man or woman, that person will serve you for six years. But in the seventh year you must let the slave go free. When you let slaves go, don’t send them away without anything. Give them some of your flock, your grain, and your wine, giving to them as the LORD has given to you. Remember that you were slaves in Egypt, and the LORD your God saved you. That is why I am commanding this to you today.