What Does Exodus 23:28 Mean?

The covenant blood-ritual : Moses dashing the sacrificial blood against the altar and then against the people: is the covenant ratification's central act. Blood is the covenant-seal in the ancient Near Eastern treaty context, and here it is applied in a specific two-part sequence. Half the blood goes to the altar (YHWH's side of the covenant) and half to the people (Israel's side): the sacrifice's blood binds both parties to the covenant in the same material. The blood-upon-the-altar and the blood-upon-the-people together create the covenant's most viscerally physical expression of mutual commitment.

The "blood of the covenant" phrase that Moses speaks when dashing the blood on the people is the Sinai covenant's most theologically concentrated formula. Hebrews 9:18-20 treats it as the pattern that the new covenant blood-sprinkling fulfills: "therefore not even the first covenant was inaugurated without blood... And in the same way he sprinkled with the blood both the tent and all the vessels used in worship." The Sinai blood-covenant is the type; the blood of Jesus is the antitype.

Mark 14:24's "this is my blood of the covenant, which is poured out for many" directly invokes Moses' "this is the blood of the covenant" formula at the last supper, explicitly identifying Jesus' blood as the new covenant's ratification-blood.

The two-halves-of-the-blood structure (altar/YHWH and people) encodes the covenant's mutual-commitment logic: both parties receive the blood-seal. YHWH receives Israel's sacrifice at his altar; Israel receives the blood-seal of YHWH's covenant at Moses' hand. The covenant binds both parties through the same blood.

The new covenant's fulfillment of this structure is asymmetric and grace-based: Christ's blood is given for the people, not returned to them as their reciprocal contribution. The new covenant's blood flows one direction, from YHWH to the covenant community, because the initiative, the performance, and the seal are all Christ's, not the community's reciprocal offering.