testament
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tes·ta·ment NOUN (in biblical use) a covenant or dispensation. a division of the Bible. See also Old Testament, New Testament.
https://www.merriam-webster.com/dictionary/testament
Definition of testament
a capitalized : either of two main divisions of the Bible
b archaic : a covenant between God and the human race
Vine's Expository Dictionary of NT Words: Testament
* For TESTAMENT see COVENANT
KJV Dictionary Definition: testament TEST'AMENT, n. L..
The name of each general division of the canonical books of the sacred Scriptures; as the Old Testament; the New Testament. The name is equivalent to covenant, and in our use of it, we apply it to the books which contain the old and new dispensations; that of Moses, and that of Jesus Christ.
Mat 6:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
Mar 14:24 And he said unto them, This is my blood of the new testament, which is shed for many.
Luk 22:20 Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
1 Cor 11:25 After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood:
this do ye, as oft as ye drink it, in remembrance of me.
2 Cor 3:6 Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.
(NOTE: not of the letter <<< Old Covenant. we have been made able ministers of the new testament)
2 Cor 3:14 But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ.
Heb 7:22 By so much was Jesus made a surety of a better testament.
Heb 9:15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
Heb 9:16 For where a testament is, there must also of necessity be the death of the testator.
Heb 9:17 For a testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.
Heb 9:18 Whereupon neither the first testament was dedicated without blood.
(NOTE : Old covenant had an animal sacrificial system)
Heb 9:20 Saying, This is the blood of the testament which God hath enjoined unto you.
Rev 11:19 And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.
(NOTE: ark of his testament)
Ex 25:22 And there I will meet with thee, and I will commune with thee from above the mercy seat, from between the two cherubims which are upon the ark of the testimony, of all things which I will give thee in commandment unto the children of Israel.
Ex 26:33 And thou shalt hang up the vail under the taches, that thou mayest bring in thither within the vail the ark of the testimony: and the vail shall divide unto you between the holy place and the most holy.
Ex 26:34 And thou shalt put the mercy seat upon the ark of the testimony in the most holy place.
Ex 30:6 And thou shalt put it before the vail that is by the ark of the testimony, before the mercy seat that is over the testimony, where I will meet with thee.
Ex 30:26 And thou shalt anoint the tabernacle of the congregation therewith, and the ark of the testimony,
Ex 31:7 The tabernacle of the congregation, and the ark of the testimony, and the mercy seat that is thereupon, and all the furniture of the tabernacle,
Ex 39:35 The ark of the testimony, and the staves thereof, and the mercy seat,
Ex 40:3 And thou shalt put therein the ark of the testimony, and cover the ark with the vail.
Ex 40:5 And thou shalt set the altar of gold for the incense before the ark of the testimony, and put the hanging of the door to the tabernacle.
Ex 40:21 And he brought the ark into the tabernacle, and set up the vail of the covering, and covered the ark of the testimony; as the LORD commanded Moses.
Jos 4:16 Command the priests that bear the ark of the testimony, that they come up out of Jordan.
Covenant or testament = binding contracts. Scripturally speaking, I see covenant & testament to be interchangeable. That's not to say, every contextual use of these two words is interchangeable. My Opinion Only!