Matthew 26:72 - Clarke's commentary and critical notes on the Bible

And again he denied with an oath, I do not know the man. And again he denied with an oath - This is a third gradation of his iniquity. He has told a lie, and he swears to support it. A liar has always some suspicion that his testimony is not credited, for he is conscious to his own falsity, and is therefore naturally led to support his assertions by oaths.