The first work to quote the Comma Johanneum as an actual part of the Epistle's text appears to be the 4th century Latin homily , probably written by Priscillian of Ávila (died 385), or his close follower Bishop Instantius. This part of the homily gradually became part of some manuscripts of the Latin Vulgate roughly around the year 800. It was subsequently back-translated into the Greek, but it occurs in the text of only four of the 500-plus Greek New Testament manuscripts of First John and in the margin of five more. The earliest known occurrence appears to be a later addition to a 10th-century manuscript now in the Bodleian Library, the exact date of the addition is not known; in this manuscript, the Comma is a variant reading offered as an alternative to the main text. The other seven sources date to the sixteenth century or later, and four of the seven are hand-written in the manuscript margins. In one manuscript, back-translated into Greek from the Vulgate, the phrase "and these three are one" is not present.