Cassiel (Hebrew קפציאל Qafsiel Kaziel) meaning “Speed of God” is the Latin name of an archangel in post-biblical Judeo-Christian religion, particularly that of the Kabbalah. Unlike many other angels, Cassiel is known for simply watching the events of the cosmos unfold with little interference. He is the angel of solitude and tears, and is said to preside over the deaths of kings. 
He is often included in lists as being one of the seven archangels and often associated with the Seventh Heaven.
In the magical text Berit Menuchah, Cassiel is associated with Kefitzat Haderech, the ability to travel quickly through time and space. Magic spells using his name are cast to create destruction, to scatter crowds, to cause a person to wander aimlessly, or to fall from a position of power.
Ancient Hebrew amulets bearing his name are used to drive away one’s enemies. The words on the charm are written with the blood of a bird and then tied to the foot of a dove. The dove is then set to flight, taking one’s enemy with it. Should the bird refuse to fly, it is a sign that one’s enemies won’t depart either.
Archangel Cassiel can also be called: Casiel, Cassel, Castiel, Cas, Cass, Casitiel, Castael, Mocoton, Kaziel, kafkiel, Qafsiel, Qaphsiel, Qaspiel, Quaphsiel. He is also known as the angel of temperance.