'Year of Release' in the Bible

Beware that there be not a wicked thought in thy heart, saying, The seventh year, the year of release, is at hand; and thine eye be evil against thy poor brother, and thou givest him nought; and he cry against thee to Jehovah, and it be sin in thee.

And Moses commanded them, saying, At the end of every seven years, at the set time of the year of release, at the feast of tabernacles,