Yitro: Chapter 13
"In the third month"

This section tells us of the two lights of the right and the left called Gemini, that is the constellation that rules over the third month, Sivan. Uriel rules over this month, and we are told of his camps, each of which has keys of light issuing from the inner supernal Chasmal. Rabbi Shimon explains the significance of twins in terms of the birth of Jacob and Esau, and then says that the Torah itself is twins - the Written Torah and the Oral Torah - given in the third month to the triple nation of the Three Fathers. And finally he tells us that the Torah was given in three parts - the Torah, the Prophets and the Writings. But the important conclusion is that all is one.