A will means nothing while the person is alive; it can be used only after the person dies.
Then Israel said to Joseph, “Look at me; I am about to die. But God will be with you and will take you back to the land of your fathers.
“I leave you peace; my peace I give you. I do not give it to you as the world does. So don’t let your hearts be troubled or afraid.
Brothers and sisters, let us think in human terms: Even an agreement made between two persons is firm. After that agreement is accepted by both people, no one can stop it or add anything to it.
When there is a will, it must be proven that the one who wrote that will is dead.
This is why even the first agreement could not begin without blood to show death.