What is "gevurah"

Gevurah or geburah (גבורה) is the fifth sephirah in the kabbalistic tree of life, and it is the second of the emotive attributes of the sephirot. It sits below Binah, across from Chesed, and above Hod.

Gevurah is 'the essence of judgment (DIN) and limitation, and corresponds to awe and the element of fire,'

In the Bahir it is written "And who are the Officers? We learned that there are three. Strength (Gevurah) Is the Officer of all the Holy Forms to the left of the Blessed Holy One. He is Gabriel."

Gevurah is associated with the color red.