John 8:58

Before Abraham was made, I am. [4] Christ here speaks of his eternal existence as God. St. Augustine shews this by these very words, I am. He does not say, before Abraham was made, I was made: because, as the Son of God, he never was made: but I am, which shews his eternal divine nature. (Witham)

[BIBLIOGRAPHY]

Abraham fieret, ego sum; Greek: prin Abraam genesthai, ego eimi. St. Augustine, (tract. xliii. in Joan. num. 17. p. 588.) intellige, fieret ad creaturam, sum vero pertinere ad divinam substantiam: non dixit, antequam Abraham esset, ego eram,... neque dixit, ego factus sum... agnoscite creatorem, discernite creaturam.