then you shall be a special treasure to Me above all people; for all the earth [ is ] Mine.
And you shall be to Me a kingdom of priests and a holy nation.
These [ are ]the words which you shall speak to the children of Israel.
Permit me to follow a rabbit trail here; there are many out there who claim that the law was abolished, that it perished at the cross, and Scripture does say that that Jesus has 'taken it out of the way, having nailed it to the cross', while the writer to the Hebrews said ( of that first [ covenant ] ) that 'what is becoming obsolete and growing old is ready to vanish away'. Though the Mosaic Law did become obsolete for the people of God, and vanished away like the vapor it was, the Law that it foreshadowed was the True Law, the Royal Law of God, you could say, the Christ Himself! ( I know; we HAVE been down this road before, but it is very important that we stay on this Path! ) There are many, many Scriptures that could be cited here that plainly say that the law, and more precisely, the royal law is good, but that it only showed the rebellious and sinful nature of man, and magnified his transgression, made it clear, so to speak. The Psalms and Proverbs, for instance, are full of such references. Now; back to our regularly scheduled programming.
For as in Adam all die, even so in Christ all shall be made alive.
Bonus question; 'Who ARE God's people?'
Going 'extra-biblical' on you, so to speak, could we not safely, more or less, speculate then, that God, since the Revelation of Jesus as the Christ, and the New Covenant, has shown how He is in covenant with 'all' His creation, and desires, through His Son, and through us, to have a blessed and intimate relationship with them? As Israel, under that 'first' ( covenant ) was made a 'a kingdom of priests and a holy nation', so we now, according to I Peter 2:5, are 'a holy priesthood', and why priests? The context of Peter's words tell us; it is so that we may offer sacrifices of love, pleasing to His nostrils! We have been given a flag ( Law ) to follow, and that flag is the banner of love that we read about in the Song of Solomon 2:4, that the Beloved placed over His Lover! Being the New Temple of the Holy Spirit, we are to offer ourselves, as did the Son of God, as living sacrifices of love, sharing His love with 'all' His creatures. As the New Israel, and thus God's Priest to the nations, or 'world', we have a renewed mandate, to have the dominion, not in a physical sense, as Israel under that 'first' ( covenant ) did, in order to symbolically cleanse the Holy Land. Our renewed mandate is to have dominion in a spiritual way, thus spilling over into the physical, over 'all' His creation, to return it to a right relationship with Him! We know from Scriptures like II Peter 3:9 ( a truly eschatological statement ) that God is 'not willing that any should perish but that all should come to repentance'. Though this was an eschatological statement, and thus was fulfilled in the first century, is it not very applicable today? Can we not safely speculate here that God desires 'all' His creation, His 'children', so to speak, to repent from their wicked and rebellious ways and return to a right relationship with Him?
Returning, once again, to Paul's universalistic statement in I Corinthians 15; as in the passage from 11 Peter, it is an eschatological statement, but would it not be safe to assume the same here? Are the two 'all' statements in that passage speaking of the same group of people, or has the definition of 'all' necessarily expanded with the Parousia of the New Covenant? Can we not safely speculate that the 'all', just as they were God's covenant 'children' who died in Adam, has now been expanded to include His entire creation, 'all' of His 'children', 'all' of whom have been made alive in, or through the sacrifice of the Son of God, though many have not yet been awakened to that reality?