Numbers 28:27
But ye shall offer the burnt offering for a sweet savour unto the Lord; two young bullocks, one ram, seven lambs of the first year;
Cross-reference
Numbers 28:11 specifies the same burnt offering (2 bulls, 1 ram, 7 lambs) for new moons as here for the Feast of Weeks.
Numbers 28:19 prescribes the same burnt offering of two bulls, one ram, seven lambs for the Feast of Unleavened Bread — identical specifications.
Numbers 29:2 prescribes a burnt offering for the Feast of Trumpets with one bull instead of two — a similar pattern but different quantity.
Leviticus 23:18 also describes the burnt offering for the Feast of Weeks but with one bull and two rams instead of two bulls and one ram — a different prescription.
Leviticus 23:19 adds the sin offering (one goat) and peace offerings (two lambs) for the same Feast of Weeks — completing the offering set.
Ezra 3:5 records the restoration of appointed feast offerings by the exiles, which would include the Feast of Weeks offering.