can anyone tell me where in scripture a priest was needed to change the host in to the eucharist?
I would like to read the verses.
Thanks.
The power was given by Christ to the Apostles, who gave it to the bishops (= episcopoi, "overseers"), who delegated to the priests (=presbyteroi, "elders"). You can see this going on in the Paul's later epistles, where he talks about commissioning Timothy "by the imposition of my hands" and about "appointing elders in every town".
Nobody in the early church thought that just anyone could consecrate the Eucharist. St. Ignatius, who knew Peter, Paul, and John, went so far as to say that celebrating the Eucharist without the bishop's approval (which would certainly include celebrating it without an ordained elder) was no different than devil worship.