Numbers 29:1, 12, 35

‘On the first day of the seventh month, you shall have a holy [summoned] assembly; you shall do no laborious work. It will be for you a day of blowing the trumpets (the shophar, ram’s horn).

‘Then on the fifteenth day of the seventh month you shall have a holy [summoned] assembly; you shall do no laborious work, and you shall observe a Feast [of Booths] to the LORD for seven days.

‘On the eighth day you shall have a solemn assembly [to mark the end of the feast]; you shall do no laborious work.