Then he took the Book of the Covenant and read it to the people. They responded,
“We will do everything the LORD has said; we will obey.”
Moses then took the blood, sprinkled it on the people

Exodus 24:7-8 (ESV)

Here was the blood of sprinkling that marked a people entering a covenant to keep the Law of God. Their salvation was already secured at the Red Sea: this was service in the kingdom.
Read of the New Covenant ‘marker’ of believers’ service in 1 Peter 1:2.

Daily Reading: Isaiah 8