Israel was said to be priests in the kingdom. Only Israel was said to be priests and a holy nation........“9 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: 10 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 KJV
Who is Peter addressing here? The same people Jesus is addressing here...
[Exo 19:5 KJV] "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:"
[Exo 19:6 KJV] "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."