Taken from WisdomsDoor:
To place an impenetrable aura of protection around you so that no discordant influences can enter your field. Also very good to use as a vehicle from which to out of body project from.
Step 1:
Imagine or visualize a upright three-dimensional Triangle (tetrahedron) above your head or above the object you want to protect.
Step 2:
Imagine or visualize a down-pointed three-dimensional Triangle (tetrahedron) above the one you just visualized.
Step 3:
Imagine these two three-dimensional shapes spinning in opposite directions.
Step 4:
Imagine these two spinning objects coming together so one interpenetrates the other.
Step 5:
Imagine these two combined and spinning objects (the Merkabah) descending upon whatever you want to protect. If that is yourself, imagine it coming down on you self.
Step 6:
Hold this image for a few seconds. You are done.