mentions:

Tertullian

The term is employed by Tertullian (AD 200):

Clement of Alexandria

Cyprian of Carthage

Cyprian of Carthage (AD 254) wrote a large number of epistles where he makes use of the term:

In addition to epistles 66, 69 and 70, the term is also found in the epistles 19, 40, 41, 42, 43, 44, 45, 46, 50, 51, 54, 63, 68, 71,