Deuteronomy 9:11; Deuteronomy 15:1; Deuteronomy 31:10

11 And it came to pass at the end of forty days and forty nights, that the LORD gave me the two tables of stone, even the tables of the covenant.
1 At the end of every seven years thou shalt make a release.
10 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,