Charles Ellicott Commentary Matthew 26:34

"Jesus said unto him, Verily I say unto thee, that this night, before the cock crow, thou shalt deny me thrice." — Matthew 26:34 (ASV)

You will deny me three times — The agreement of all four Evangelists places the fact of the prediction beyond the shadow of a doubt. The prevision it implies is obviously more than a general insight into the instability of the disciple’s character; it involves a power that is essentially superhuman. We must not forget what the disciple could not fail to remember: that the penalty attached to this foretold sin was that whoever was guilty of it would be denied before the angels of God (Luke 12:9). That was the law of retribution, but as with all such laws, the penalty could be averted by repentance.