The Anathema appended to the Creed of Nicæa condemns those who said πρὶν γεννηθῆναι οὐκ ἦν.  On this Eusebius of Cæsarea (Epist. § 9) remarks:  “Moreover to anathematize ‘Before His generation He was not,’ did not seem preposterous, in that it is confessed by all, that the Son of God was before the generation according to the flesh.”