Mark 14:30
“Truly I tell you,” Jesus replied, “this very night, before the rooster crows twice, you will deny Me three times.”
What it says
Jesus says Peter will deny him three times before the rooster crows twice that night.
What it is doing
The verse gives the specific failure in advance.
In context
27Then Jesus said to them, “You will all fall away, for it is written: 28But after I have risen, I will go ahead of you into Galilee.” 29Peter declared, “Even if all fall away, I never will.” 30“Truly I tell you,” Jesus replied, “this very night, before the rooster crows twice, you will deny Me three times.” 31But Peter kept insisting, “Even if I have to die with You, I will never deny You.” And all the others said the same thing.