Leviticus 25:8

8 And thou shalt reckon to thyself seven sabbaths of years, seven times seven years; and they shall be to thee seven weeks of years, nine and forty years.

Leviticus 25:8 Meaning and Commentary

Leviticus 25:8

And thou shalt number seven sabbaths of years unto thee
Or weeks of years; and there being seven days in a week, and a day being put for a year, seven weeks of years made forty nine years; the Targums of Onkelos and Jonathan, and Jarchi, interpret it seven "shemittas", or sabbatical years; and a sabbatical year being every seventh year, made the same number;

seven times seven years:
or forty nine years, as follows;

and the space of the seven sabbaths of years shall be forty and nine
years;
just such a space of years there was between each jubilee, which, as afterwards said, was the fiftieth year; so as there were a seventh day sabbath, and a fiftieth day sabbath, the day of Pentecost, so there were a seventh year sabbath, or sabbatical year, and a fiftieth year sabbath.

Leviticus 25:8 In-Context

6 And the sabbaths of the land shall be food for thee, and for thy man-servant, and for thy maid-servant, and thy hireling, and the stranger that abides with thee.
7 And for thy cattle, and for the wild beats that are in thy land, shall every fruit of it be for food.
8 And thou shalt reckon to thyself seven sabbaths of years, seven times seven years; and they shall be to thee seven weeks of years, nine and forty years.
9 In the seventh month, on the tenth day of the month, ye shall make a proclamation with the sound of a trumpet in all your land; on the day of atonement ye shall make a proclamation with a trumpet in all your land.
10 And ye shall sanctify the year, the fiftieth year, and ye shall proclaim a release upon the land to all that inhabit it; it shall be given a year of release, a jubilee for you; and each one shall depart to his possession, and ye shall go each to his family.

The Brenton translation of the Septuagint is in the public domain.