Sefer Yetzira, ascribed to the Patriarch Abraham,is a basic treatise for Jewish Mystical Meditation.
Several of its chapters deal with the unique qualities
of each of the 12 Jewish months
and their association with a specific
Tribe, Attribute, Hebrew Letter,
Controling Limb of the Body and Zodiac Sign.

Source: Tishrei — תשרי @ Sefer Yetzira