Exodus 24:5

24:5 He sent young Israelite men, and they offered burnt offerings and sacrificed young bulls for peace offerings to the Lord.

Exodus 24:7-8

24:7 He took the Book of the Covenant and read it aloud to the people, and they said, “We are willing to do and obey all that the Lord has spoken.” 24:8 So Moses took the blood and splashed it on the people and said, “This is the blood of the covenant that the Lord has made with you in accordance with all these words.”