Writing on Islam's claim of Abrahamic ancestry, John explained that the Arabs were called "Saracens" (Greek Σαρακενοί, Sarakenoi) because they were "empty" (κενός, kenos, in Greek) "of Sarah".
Menulis tentang klaim Islam sebagai keturunan Ibrahim, John menjelaskan bahwa orang Arab disebut "Sarasen "(Yunani: Σαρακενοί, Sarakenoi) karena mereka "kosong"(κενός, kenos, dalam bahasa Yunani) dari "Sarah".