Mark 14:68-71

68But he denied it, saying, “I neither know nor understand what you are talking about.” Then he went out [of the courtyard] to the porch, [and a rooster crowed.]

69The servant-girl saw him, and began once more to tell the bystanders, “This [man] is one of them.”

70But again he denied it. After a little while, the bystanders again said to Peter, “You are in fact one of them, for [it is clear from your accent, that] you are a Galilean, too.”

71But he began to invoke a curse [on himself] and to swear [an oath], “I do not know this man you are talking about!”