If a person intentionally commits a murder, nothing can “buy him out.” One understands that one cannot remain on the spiritual path if one doesn’t eradicate the desire to kill. If one doesn’t cope with correcting the desire to kill by dealing with it, other than simply slaying it, then the entire system, all of one’s ten Sefirot, abandon one’s deed.
“… from My altar…” signifies that nothing is left in the Partzuf, that it is totally empty up to the level of Malchut. Thus, a person must begin working from the very beginning. No sacrifices of his are accepted at this point.
If one is unable to work with something or someone and thinks that they must be murdered, it means that one is not capable of correcting anything or anyone at all. It makes this person completely untrustworthy. There is no such desire, person, phenomenon, or action in this world that doesn’t need to be corrected or that is impossible to correct. Everything there is depends on correction, until it reaches the stage of the final correction.
From KabTV’s “Secrets of the Eternal Book” 3/11/13