The Bible
Deuteronomy 15
Every seven years, all debts are to be released—The people are admonished to care for the poor—Hebrew servants are to be released and given gifts during the seventh year—The firstling males of herds and flocks are the Lord’s.
1At the end of every seven years thou shalt make a release.
13And when thou sendest him out free from thee, thou shalt not let him go away empty:
23Only thou shalt not eat the blood thereof; thou shalt pour it upon the ground as water.