Here is the footnote form the original Douay Rheims Bible of 1609, which has the best footnotes of any English Study in my opinion,
My two witnesses. Enoch and Elijah, as is commonly expounded. For that Elijah shall again come before the latter day, “it is a most notorious known thing (to use St. Augustine’s words) in the mouths and hearts of faithful men.” (See li. 20. de Civit. Dei. c. 29. Tract. .4. in Joan, and both of Enoch and Elijah, lib. J . de pec. merit, c. 3). So the rest of the Latin Doctors: as, St. Jerome, (ad Pammach. ep. 61. c. 11. and in Psal. xx). St. Ambrose in (Psal. xlv.) St. Hilary, (20. can. in Mat.) Prosper, (li. ultimo de Promissionibus, c. 13). St. Gregory, (li. 14, Moral, c. 11. ho. 12. in Ezech). St. Bede in (ix. Marci). The Greek Fathers also, as St. Chrysostom. (hom. 58. in Mat and ho. 4. in 2 Thessal. ho. 21. in Genes, and ho. ‘2-2. in ep. ad Hebr.) Theophylact and Oecumenus in (xvii. Matthan). St. John of Damascus, (li. 4. de Orthodoxa fide, c. 97). Furthermore, that they live also in Paradise, it is partly gathered out of the Scripture, Sirach 44:16, where it is plainly said of Enoch, that “he is translated into Paradise,” as all our Latin copies do read: and of Elijah, that he was taken up alive, it is evident, 2 Kings 2:11. And St. Irenaeus says, it is the tradition of the Apostles that they are both there (Li. 5. initio). " Dicunt Presbyteri (says he) qui sunt Apostolorum Discipuli, So say the Priests or Ancients that are the scholars of the Apostles.’’- See St. Justin Martyr, (q. So. ad Orthodoxos). Finally, that they shall return into the company of men in the end of the world, to preach against Antichrist, and to invite both Jews and Gentiles to penance, and so be martyred, as this place of the Apocalypse seems plain, so we have in part other testimonies of this, Malachi 4. Sirach 44:16. 48:10. Mat. 17:11. See also Hippolytus’s book of “Antichrist and the end of the world.” All which being well considered, the heretics are too combative and doubtful, to discredit the same, as they commonly do.
I may have assumed wrongly about the Hebrews passage being a common interpretation by the Fathers. I will look more into it.