Mark 16:9–20 in the manuscripts and patristic evidence
The earliest clear evidence for Mark 16:9-20 as part of the Gospel of Mark is in Chapter XLV First Apology of
Justin Martyr (c. 160). In a passage in which Justin treats Psalm 110 as a Messianic prophecy, he states that Ps. 110:2 was fulfilled when Jesus' disciples, going forth from Jerusalem, preached everywhere. His verbiage is remarkably similar to the wording of Mk. 16:20 and is consistent with Justin's use of a Synoptics-Harmony in which Mark 16:20 was blended with Lk. 24:53. Justin's student
Tatian (c. 172), incorporated the "Longer Ending" into his
Diatessaron, a blended narrative consisting of material from all four canonical Gospels. And
Irenaeus (c. 184), in
Against Heresies 3:10.6, explicitly cited Mark 16:19, stating that he was quoting from near the end of Mark's account. This patristic evidence is over a century older than the earliest manuscript of Mark 16. Writers in the 200's such as Hippolytus, Porphyry, and the anonymous author of
De Rebaptismate also used the "Longer Ending."
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The writings of these Church father is much older than Sinaiticus and Vaticanus, not to mention that Sinaiticus and Vaticanus themselves disagree with each other over 3,000 times in the gospels alone. These two texts are considered the authority for bibles today on these verses...well for the entire New Testament. westcott-hort, nestle aland, and the united bible society favored these texts with a primacy towards Vaticanus for their New Testament because they are the oldest found texts. Who cares that the Early church fathers quoted majoritively from what resembles the majority texts. To be clear the modern scholars don't believe the majority texts were even written at that time even in light of obviously knowing this information I'm presenting. They use Sinaiticus and Vaticanus simply because they are the oldest texts around even though they don't even agree with each other let alone with the majority of the Early church fathers quotations on the New Testament texts they were using even though the ones I'm talking about lived and died before the Sinaiticus and Vaticanus were even written.
A weird coincidence, I shouldn't really mention, the Gospel of Mark is 678 verses total with these twelve verses.