Now therefore,
if ye will obey my voice indeed,
and keep my covenant,
then ye shall be a peculiar treasure
unto me above all people:
for all the earth is mine:
And ye shall be unto me a kingdom of priests,
and an holy nation.
These are the words which thou shalt speak
unto the children of Israel.
Exodus 19:5-6
But ye are a chosen generation,
a royal priesthood,
an holy nation,
a peculiar people;
that ye should shew forth the praises of him
who hath called you out of darkness
into his marvellous light:
Which in time past were not a people,
but are now the people of God:
which had not obtained mercy,
but now have obtained mercy.
1 Peter 2:9-10
Praise to God that Old Testament believers and New Testament believers are the holy nation, children of Israel.