A will only holds in cases of death; it is never valid so long as the testator is alive.
To take an illustration from human life, my brothers. Once a man's will is ratified, no one else annuls it or adds a codicil to it.
Peace I leave to you, my peace I give to you; I give it not as the world gives its 'Peace!' Let not your hearts be disquieted or timid.
Thus, in the case of a will, the death of the testator must be announced.
Hence even the first covenant of God's will was not inaugurated apart from blood;