They already knew one of them would betray Jesus, but it didn’t get better. Now Jesus was telling Peter that He didn’t believe his promise to stay loyal:
Matthew 26:34I tell you the truth, Peter—this very night, before the rooster crows, you will deny three times that you even know me.
What a shock! Did that make him as bad as this unknown betrayer?
Matthew 26:35 No! Even if I have to die with you, I will never deny you!
The other disciples came in, of course, with a me too.