The celebration of every seventh year, and especially every fiftieth year, which was after 7 × 7. Jewish slaves were to be released and mortgaged land returned (Lev. 25: 8–13, cf. Luke 4: 18–19). This was more of an ideal than actual practice, though it may have at least discouraged the slave business. The word ‘jubilee’ is from the Hebrew for a ‘trumpet’ which was blown to inaugurate the year of jubilee.