1 Corinthians 15:6

After that, he was seen of over five hundred brethren at once; of whom the greater part remain until now, but some are fallen asleep.
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Ambrosiaster

AD 400
This is not recorded in the Gospels, but Paul knew it independently of them. Commentary on Paul’s Epistles.

Cornelius a Lapide

AD 1637
After that He was seen of above five hundred brethren. The Greek word for above means (a) "more than," (b) "from heaven." Chrysostom and Theophylact take it here in the latter sense. For Christ appeared, they say, not walking on the ground, but above their heads, as though descending from the sky; and He did this that He might show them that He had ascended as well as risen, and might confirm their faith in His ascension. Hence any one may gather that Chrysostom thought that this appearance of Christ took place after His Ascension; but still it is not true, nor is of necessity gathered from what Chrysostom says. This appearance of Christ, whether on a higher spot, as if from heaven, or in the air, evidently was prior to His ascension; and this is the common opinion of doctors; for we read nowhere of any public appearance after His ascension. Many suppose that this was the well-known appearance of Christ on a mountain in Galilee, which He had so many times promised. All His disciples ...

Cyril of Jerusalem

AD 386
“He appeared to Cephas; and after that to the twelve.” So if you disbelieve one witness, you have twelve witnesses. “Then he was seen by more than five hundred people at once”—if they disbelieve the twelve, then listen to the five hundred. “After that he was seen by James,” his own brother and the first overseer of this [Jerusalem] diocese. Since so noteworthy a bishop was privileged to see the risen Christ, along with the other disciples, do not disbelieve. But you may say that his brother was a biased witness. So then he continues: “He was seen by me.” But who am I? I am Paul, his enemy! “I was formerly a persecutor” but now preach the good news of the resurrection.

John Chrysostom

AD 407
Paul does not say that some have died but that they have fallen asleep, thereby confirming the truth of the resurrection.

Shepherd of Hermas

AD 150
Those square white stones which fitted exactly into each other, are apostles, bishops, teachers, and deacons, who have lived in godly purity, and have acted as bishops and teachers and deacons chastely and reverently to the elect of God. Some of them have fallen asleep, and some still remain alive.

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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