Analysis of information sources in references of the Wikipedia article "Denial of the virgin birth of Jesus" in English language version.
Apparently Jerome does not say in so many words that the Ebionites denied the virgin birth. But he seems to contrast their view with the acceptance of the doctrine on the part of the Nazarenes. In one place, Epiphanius says that he does not [...] the terminology (at least) differs; for by these writers those who accepted the virgin birth are called "Nazarenes," while the term Ebionites is reserved for those who denied it. Epiphanius' terminology has been followed by some scholars[.]