By means of a “last will and testament,” men indicate the desired disposition of their property at death. The title page of the latter section of our Bibles reads, “The New Testament of Jesus Christ.” While uninspired publishers supplied this title page, the inspired text refers to itself as the will or testament of the Lord:

For where a testament is, there must of necessity be the death of him that made it. For a testament is of force where there hath been death: for it doth never avail while he that made it liveth (Hebrews 9:16–17, ASV).

The immediate context (vv. 11–15) makes it clear that the will/testament of the Christ is in view in the quoted verses.

Several parallels exist between the making and execution of human wills and the making and execution of Jesus’ last will and testament:

While living, one may dispose of his property as he desires. However, when he dies, if he has a will, his estate will be dispersed only to those named in the will and according to its conditions, if any. Jesus gave many blessings, including forgiveness of sins, on various conditions during His earthly life, but since He died, His written will prevails.
A will takes effect only when its maker dies. This fact is no less true of the Divine will of Jesus than of human wills (Heb. 9:16–17). Jesus referred to the blood He shed on Calvary as “my blood of the new testament” (Matthew 26:28, KJV), signaling that it would go into effect at His death. This fact coincides with Paul’s statement that at Jesus’ death on the cross, he took the Old Testament “out of the way, nailing it to the cross” (Col. 2:14). It will be in effect as long as the world stands (Matthew 28:18–20).
A person must be qualified to write a will. Human testators must have attained majority, be of sound mind, and not be influenced by coercion or by a mind-altering chemical substance. Jesus was qualified in every respect, possessing Divine wisdom and knowledge (John 12:49). He was not subject to coercion (John 10:17–18). None can invalidate His will. He declared, “Heaven and earth shall pass away, but my word shall not pass away” (Matthew 24:35).
A new will voids all previous wills. While living, one may replace or revise a will several times, but at death, only the last one he made has legal standing. God gave a testament/covenant through Moses to Israel fifteen centuries before Jesus was born. However, God made a new covenant/testament for all mankind through His Son. He “took away” the first one in His death (Hebrews 10:8–9). Thus Jesus “nailed to the cross” the first testament’s authority (Colossians 2: 14). One finds true religion only in the New Testament, not in the old (Hebrews 1:1–3). Only the last will of the Lord is in force.
One must meet the conditions of the will to be an heir. One does not inherit merely on the basis of desire, feelings, or belief that he should, but upon meeting the will’s provisions (Matthew 7:21–23). Only God’s children are heirs (Romans 8:17) of the inheritance that is “incorruptible, and undefiled, and that fadeth not away” (I Peter 1:4). These are named in the “book of life” that will be opened at the “reading” of Jesus’ will, otherwise known as The Judgment (John 12:48; Revelation 20:11–15).

The principal aim of each one of us should be to so submit to the will of the Christ that He will inscribe—and keep—our names in the book of life as beneficiaries of His Testament.

Dub McClish