"And you shall take for yourselves on the first day..."—Leviticus 23:40.
We are commanded to take a lulav (palm branch) [along with willows, myrtles and a citron] and rejoice before G‑d on the seven days of the holiday of Sukkot.
Only in the area of the Holy Temple is this mitzvah biblically mandatory for the seven days of the holiday. In all other locations, the biblical obligation extends only to the first day of the holiday.
Women are exempt from this mitzvah.