"Seven days ye shall offer an
offering made by fire unto YHVH:
on the eighth day shall be an holy convocation unto you;
and ye shall offer an offering made by fire unto YHVH:
it is a solemn assembly; and
ye shall do no
servile work therein."
Leviticus 23:39
"Also in the fifteenth day
of the seventh month, when ye have gathered in the fruit
of the land, ye shall keep a feast unto YHVH seven days:
on the first day shall be a sabbath, and
on the eighth day
shall be a sabbath."
Numbers 29:35
"On
the eighth day ye shall have a solemn
assembly: ye shall do
no servile work therein:"