New Living Translation
Peter swore, “A curse on me if I’m lying—I don’t know this man you’re talking about!”

American Standard Version
But he began to curse, and to swear, I know not this man of whom ye speak.

Berean Study Bible
But he began to curse and swear, “I do not know this man of whom you speak!”

Douay-Rheims Bible
But he began to curse and to swear, saying; I know not this man of whom you speak.

English Revised Version
But he began to curse, and to swear, I know not this man of whom ye speak.

King James Bible
But he began to curse and to swear, saying, I know not this man of whom ye speak.

World English Bible
But he began to curse, and to swear, "I don't know this man of whom you speak!"

Young's Literal Translation
and he began to anathematize, and to swear -- 'I have not known this man of whom ye speak;'

Mark 14:71 Additional Translations ...