John Lightfoot on John 8:58

[Before Abraham was, I am.] They pervert the question. Christ had said, 'Abraham saw my day': on the contrary, they ask him, 'Hast thou seen Abraham?'

This phrase, I am, sometimes is rendered from the single word I. So the Greek interpreters in the Books of Judges and Ruth: for you seldom or never meet with it elsewhere.

Judges 6:18; "I will tarry or sit here." Ibid. chapter 11:27; Wherefore I have not sinned against thee. Ibid. verse 35; For I have opened my mouth. Ibid. verse 37; I and my fellows. Ruth 4:4; I will redeem it.

As to this form of speech, let those that are better skilled in the Greek tongue be the judges.