Why, at a burial, are we admonished not to pass the shovel from hand to hand, but rather to place the shovel in the pile of soil for the next person to pick up?

The Achronim bring two reasons: A. To prove that there is no human who can control death and the shovles belong to no one. B. So as not to pass ill blessings from one to another. Best Wishes, Rabbi Ro'i Margalit