testament

noun

1. A solemn, authentic instrument in writing, by which a person declares his or her will as to disposal of his or her inheritance (estate and effects) after his or her death, benefiting specified heir(s).
2. One of the two parts to the scriptures of the Christian religion: the New Testament, considered by Christians to be a continuation of the Hebrew scriptures, and the Hebrew scriptures themselves, which they refer to as the Old Testament.
3. A tangible proof or tribute.“The ancient aqueducts are a testament to the great engineering skill of the Roman Empire.”
4. A credo, expression of conviction“The prime minister's speech was a glowing testament to the cabinet's undying commitment to the royal cause.”