Deuteronomy
King James Version (KJV)

“And Moses commanded them, saying, At the end of every seven years, in the solemnity of the year of release, in the feast of tabernacles,”
King James Version (KJV)
31:10 The year of release - When they were freed from debts and troubles, and cares of worldly matters, and thereby fitter to attend on God and his service.