'Seventh Year' in the Bible

If you get a Hebrew servant for money, he is to be your servant for six years, and in the seventh year you are to let him go free without payment.

but the seventh year thou shalt let it rest and lie fallow; that the poor of thy people may eat: and what they leave the beast of the field shall eat. In like manner thou shalt deal with thy vineyard, and with thy oliveyard.