The 169th mitzvah is that we are commanded to hold a lulav [palm branch, together with the other three species, esrog, myrtle, willow] and to rejoice before G‑d for seven days [i.e. the holiday of Sukkos].
The source of this commandment is G‑d's statement, "And you shall take for yourselves."
The details of this mitzvah are explained in tractate Sukkah. There it is explained that only in the Holy Temple is this mitzvah obligatory for seven days. Elsewhere, the Biblical obligation is only on the first day.
Women are not obligated in this mitzvah.