The Book of Creation (Sefer Yetzirah) 2:2 on the Hebrew Letters:
Twenty – two foundation letters,
He engraved them, He carved them, He permuted them,
He weighed them, He transformed them,
And with them, He depicted all that was formed
and all that would be formed.
First, the letters were engraved out of nothingness. Then they were craved, permuted and weighed. Each letter representing a different type of information. G – d created everything through manipulation of the letters.
Please do not take text Sefer Yetzirah text literally but as a metaphor !
The most widespread opinion is that Avraham is the author of The Book of Creation (Sefer Yetzirah). Maybe not in a literal sense such as a printed version but the teachings and wisdom of Sefer Yetzirah were known to Avraham and passed on to the following generations. Saadia Gaon explains that not the entire Sefer Yetzirah was taught by Avraham and parts of the text were developed in the course of time.
Sefer Yetzirah is about the mystical side of the Hebrew alphabet !