Under the Law of Moses, Israel was to celebrate the Feast of Trumpets on the first day of the seventh month.
The seventh month of the religious calendar (September-October) held three significant events:
- Feast of Trumpets (day 1)
- Day of Atonement (day 10)
- Feast of Tabernacles (days 15-21)
As the name indicates, the Feast of Trumpets included the sounding of trumpets. Curiously little detail is provided in the Law as to the significance of the Feast of Trumpets. This one-day event did not include mandatory travel to Jerusalem. The third and final annual pilgrimage to Jerusalem would occur with the Feast of Tabernacles.
1 ‘Now in the seventh month, on the first day of the month, you shall have a holy convocation. You shall do no service work. It shall be a signal day for you.
2 You shall offer a whole burnt offering as a sweet aroma to the Lord: one young bull from the oxen, one ram, and seven unblemished male lambs in their first year, 3 with their grain offering of fine flour mixed with oil: three-tenths of an ephah for each young bull, two-tenths for the one ram, 4 and one-tenth for each of the seven male lambs, 5 and one young male from the goats as a sin offering to make atonement for you, 6 in addition to the whole burnt offerings for the first day of the month, with their grain offerings and drink offerings, and the regular whole burnt offering, with their grain offerings and drink offerings, according to their interpretation, as a sweet aroma to the Lord.Numbers 29:1-6 OSB
Leviticus adds little more on the subject:
23 Again, the Lord spoke to Moses, saying, 24 “Speak to the children of Israel, saying, ‘In the seventh month, on the first day of the month, you shall have a rest, a memorial of trumpets, a holy convocation for you. 25 You shall do no service work on it, and you shall offer a whole burnt offering to the Lord.’”Leviticus 23:23-25 OSB