'Testament' in the Bible

And in the same way He took the cup after they had eaten, saying, “This cup, which is poured out for you, is the new covenant [ratified] in My blood.

But [in fact] their minds were hardened [for they had lost the ability to understand]; for until this very day at the reading of the old covenant the same veil remains unlifted, because it is removed [only] in Christ.

Brothers and sisters, I speak in terms of human relations: even though a last will and testament is just a human covenant, yet when it has been signed and made legally binding, no one sets it aside or adds to it [modifying it in some way].

For this reason He is the Mediator and Negotiator of a new covenant [that is, an entirely new agreement uniting God and man], so that those who have been called [by God] may receive [the fulfillment of] the promised eternal inheritance, since a death has taken place [as the payment] which redeems them from the sins committed under the obsolete first covenant.

For where there is a will and testament involved, the death of the one who made it must be established,

for a will and testament takes effect [only] at death, since it is never in force as long as the one who made it is alive.

saying, “This is the blood of the covenant [that seals and ratifies the agreement] which God ordained and commanded [me to deliver to] you.”

“This is the covenant that I will make with themAfter those days, says the Lord:I will imprint My laws upon their heart,And on their mind I will inscribe them [producing an inward change],”He then says,

Now may the God of peace [the source of serenity and spiritual well-being] who brought up from the dead our Lord Jesus, the great Shepherd of the sheep, through the blood that sealed and ratified the eternal covenant,