Exodus 19:
The same symbolism applies in the NT, 1 Peter 2:6a you will be for me a kingdom of priests and a holy nation.
Revelation 1:9 But you are a chosen people, a royal priesthood, a holy nation, God’s special possession, that you may declare the praises of him who called you out of darkness into his wonderful light.
The OT Israelite kingdom of priests became the NT Christian kingdom of priests serving the same God.6 and has made us to be a kingdom and priests to serve his God and Father—to him be glory and power for ever and ever! Amen.