The answer is: Sprinkled it on the people

Ex 24:7-8

After reading the Book of the Covenant, Moses took the bold step of sprinkling blood on the people, signaling a serious commitment between them and God. This moment captures a unique blend of celebration and solemnity—what more intense way to signify an agreement than with a splash of blood? It may sound strange by today’s standards, but in the culture of ancient Israel, blood was seen as the very essence of life, symbolic of the presence and covenantal binding with God.

In Exodus 24:7-8, the act of sprinkling blood was not merely a ritual but an emphatic way to express a sacred bond—this was their "I do" moment, so to speak. The Hebrew concept of making a covenant often involved physical tokens, and what better than life itself to represent the seriousness of their promises?

This remarkable event echoes throughout biblical narratives, forming the backdrop for understanding later spiritual concepts. The New Testament draws on this imagery as well—with Jesus mentioned as the mediator of a "new covenant," highlighting the transformative power of sacrifice and commitment.

Interestingly, this practice of blood offerings reminds us of how critically involved relationships and rituals were for the people—ceremonial observance intertwined deeply with identity. So the next time we think about covenants, let’s realize it’s way more than just words; it's about life, commitment, and a community bound together through shared promises.