And you shall be unto me a kingdom of priests, and a holy nation. These are the words which you shall speak unto the children of Israel.
All Commentaries on Exodus 19:6 Go To Exodus 19
Ambrose of Milan
AD 397
How indeed but in his body did Christ expiate the sins of the people? In what did he suffer, save in his body—even as we said: “Christ having suffered in the flesh”? In what is he a priest, save in that which he took unto himself the vocation of a priestly nation? On the Christian Faith.