Genesis 2:15
The LORD God took the man and put him in the garden of Eden to work it and keep it.
Adam is told to “work” and “keep” the garden. Some translations will say something like “till” or “cultivate” the garden. The Hebrew terms are ABD (avodth) and SMR (shamar), literally meaning serve and keep.
The ideas of “service” and “keeping,” when used together like this, have exactly one reference in the rest of the Old Testament: priesthood.
You will find the combination of terms used in Numbers 3:7-8; 8:26; and 18:5-6. All of these passages have to do with the priests keeping the sanctuary and serving before the tabernacle.
Now, given what we know of Eden’s sanctuary imagery (see here and here) it should not surprise us to find that Adam was a priest. His major sin was not so much a failure to “do good works” (in the common understanding of that phrase), but rather it was a defilement of holy things.
Thus Jesus’ “positive righteousness” was his qualification for the priesthood. That which he offered up, however, was not himself as priest, for priests never offer their own status as priest as the sacrifice, but rather himself as the paschal victim.
The life is in the blood.