Numbers 28:26-31 reminded the Israelites of what God wanted for the Feast of Weeks, which we know more commonly as Pentecost,

“Also on the day of the firstfruits, when you bring a new grain offering to the Lord at your Feast of Weeks, you shall have a holy convocation. You shall do no customary work. You shall present a burnt offering as a sweet aroma to the Lord: two young bulls, one ram, and seven lambs in their first year, with their grain offering of fine flour mixed with oil: three-tenths of an ephah for each bull, two-tenths for the one ram, and one-tenth for each of the seven lambs; also one kid of the goats, to make atonement for you. Be sure they are without blemish. You shall present them with their drink offerings, besides the regular burnt offering with its grain offering (Numbers 28:26–31).

For this important time in the life of the nation, the Lord wanted them to do the following:

1. Bring a new grain offering
2. Have a holy convocation
3. Do no customary work
4. Offer a burnt offering
5. Offer drink offerings

He specified that the burnt offering had to be without blemish, foreshadowing the perfect sacrifice of Jesus Christ for us, who are full of spiritual blemishes. Praise God that centuries earlier He had revealed His plan in the sacrifices of Israel.