They all said that they would not deny Jesus (Mk 14:31-14:31)

“But Peter

Said vehemently.

‘Even though

I must die

With you,

I will not deny you.’

All of them

Said the same.”

 

ὁ δὲ ἐκπερισσῶς ἐλάλει Ἐὰν δέῃ με συναποθανεῖν σοι, οὐ μή σε ἀπαρνήσομαι. ὡσαύτως δὲ καὶ πάντες ἔλεγον

 

This is almost word for word in Matthew, chapter 26:35.  Mark indicated that Peter kept emphatically saying to Jesus (δὲ ἐκπερισσῶς ἐλάλει) that even if it was necessary that he had to die with Jesus (Ἐὰν δέῃ με συναποθανεῖν σοι), he would never deny or repudiate him (οὐ μή σε ἀπαρνήσομαι).  Then all the other disciples said the same thing (ὡσαύτως δὲ καὶ πάντες ἔλεγον).  Thus, all the 12 apostolic leaders exaggerated their own loyalty to Jesus.