Matthew 18:16

18:16 But if he does not listen, take one or two others with you, so that at the testimony of two or three witnesses every matter may be established. ¹ 

Matthew 26:34

26:34 Jesus said to him, “I tell you the truth, ²  on this night, before the rooster crows, you will deny me three times.”

Matthew 26:75

26:75 Then Peter remembered what Jesus had said: “Before the rooster crows, you will deny me three times.” And he went outside and wept bitterly. ³ 

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¹ sn A quotation from Deut 19:15.

² tn Grk “Truly (ἀμήν, amhn), I say to you.”

³ sn When Peter went out and wept bitterly it shows he really did not want to fail here and was deeply grieved that he had.