Diatessaron

[Dawid]

I have to agree with Lector in saying that the GOH is probably not the same as the Diatessaron. Look, for instance, at Jerome's quotations of the GOH. Many of them are from an entirely separate Gospel, not from the Diatessaron. The theory that it is from Matthew also seems unlikely. George Howard has pointed out the problems with that theory (I think Ray Pritz touched on them aswell).
However, I think that the GOH was preserved by the Nazarenes long after the Ebionites had mutilated it. This would be where Jerome and later Church writers got their quotations of it from.

Shalom,
David