New Revised Standard Version
Now, the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall keep the festival of the LORD, lasting seven days; a complete rest on the first day, and a complete rest on the eighth day.

Contemporary English Version
Remember to begin the Festival of Shelters on the fifteenth day of the seventh month after you have harvested your crops. Celebrate this festival for seven days in honor of me and don't do any work on the first day or on the day following the festival.

New American Bible
On the fifteenth day, then, of the seventh month, when you have gathered in the produce of the land, you shall celebrate the feast of the LORD for a whole week. The first and the eighth day shall be days of rest.

Douay-Rheims Bible
So from the fifteenth day of the seventh month, when you shall have gathered in all the fruits of your land, you shall celebrate the feast of the Lord seven days. On the first day and the eighth shall be a sabbath: that is a day of rest.

So from the fifteenth day of the seventh month, when you shall have gathered in all the fruits of your land, you shall celebrate the feast of the Lord seven days. On the first day and the eighth shall be a sabbath: that is a day of rest.

when

Leviticus 23:34 Say to the children of Israel: From the fifteenth day of this same seventh month, shall be kept the feast of tabernacles, seven days to the Lord.

Exodus 23:16 And the feast of the harvest of the firstfruits of thy work, whatsoever thou hast sown in the field. The feast also in the end of the year, when thou hast gathered in all thy corn out of the field.

Deuteronomy 16:13 Thou shalt celebrate the solemnity also of tabernacles seven days, when thou hast gathered in thy fruit of the barnfloor and of the winepress.

on the first

Leviticus 23:24,36 Say to the children of Israel: The seventh month, on the first day of the month, you shall keep a sabbath, a memorial, with the sound of trumpets, and it shall be called holy. . . .