Numbers 29:12-13

12‘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.

13You shall present a burnt offering, an offering by fire as a sweet and soothing aroma to the Lord: thirteen bulls, two rams, and fourteen male lambs one year old, which are without blemish;