The answer is: Sprinkled it on the people

Ex 24:7-8

After Moses read the Book of the Covenant, he not only shared the laws with the people, but he also took a significant step in sealing the bond between them and God. Sprinkling the blood of the sacrifices on the people was a profound act. It symbolized their acceptance of the covenant and their commitment to God’s commandments. Blood in biblical traditions largely represents life and also serves as a purifying agent—not just of individuals but of their relationships with the divine.

Imagine the scene: Moses gathering the people around, the air filled with anticipation. The people shout, "We will do everything the Lord has said!" Think about that level of commitment—from a historical perspective, this event underscores the community-oriented practice of honoring agreements. It’s a stark contrast to how we might interact with promises today. This biblical moment connects deeply to later events in scripture. For instance, in the New Testament, the Last Supper draws upon themes of blood and covenant as well (Matthew 26:28) but shifts the focus to universal reconciliation rather than merely the Israelite context.

Using blood as a physical reminder could lead to contemplations on our own pacts and promises. Sprinkling, being an act meant to incorporate, illustrates the idea of being 'called' into community—not just being passive spectators but active participants in a journey that invites every single member of a faith tradition to take ownership. It’s pretty fascinating when you think of the depth in what might seem just an ancient ritual!