Eusebius: Ecclesiastical History, VI. 14.

And in the Hypotyposes, in a word, he has made abbreviated narratives of the whole testamentary Scripture; and has not passed over the disputed books,--I mean Jude and the rest of the Catholic Epistles and Barnabas, and what is called the Revelation of Peter. And he says that the Epistle to the Hebrews is Paul's, and was written to the Hebrews in the Hebrew language; but that Luke, having carefully translated it, gave it to the Greeks, and hence the same colouring in the expression is discoverable in this Epistle and the Acts; and that the name "Paul an Apostle" was very properly not prefixed, for, he says, that writing to the Hebrews, who were prejudiced against him and suspected, he with great wisdom did not repel them in the beginning by putting down his name.