John Chrysostom
Catena Aurea · Matthäusevangelium 26
And when they had sung an hymn, they went out into the mount of Olives. Then saith Jesus unto them, All ye shall be offended because of me this night; for it is written, I will smite the shepherd, and the sheep of the flock shall be scattered abroad. But after I am risen again, I will go before you into Galilee. Peter answered and said unto him, Though all men shall be offended because of thee, yet will I never be offended. Jesus said unto him, Verily I say unto thee, That this night, before the cock crow, thou shalt deny me thrice. Peter said unto him, Though I should die with thee, yet will I not deny thee. Likewise also said all the disciples.
In this we see what the disciples were both before and after the cross. They who could not stand with Christ whilst He was crucified, became after the death of Christ harder than adamant. This flight and fear of the disciples is a demonstration of Christ’s death against those who are infected with the heresy of Marcion. If the had been neither bound nor crucified, whence arose the terror of Peter and the rest?