1. Jesus fulfilled the Old Covenant.
"fulfilled"
per American Heritage

Definition of `fulfil` 1. To bring into actuality; effect. 2. To carry out (an order, for example). 3. To measure up to; satisfy. 4. To bring to an end; complete.

  2. Under the Old Covenant (Testament), Gentiles were alienated from Israel; Jesus removed this enmity by the cross.
"Colossians 2:14"

Col 2:14-- having blotted out the bond written in ordinances that was against us, which was contrary to us: and He hath taken it out that way, nailing it to the cross; ASV

  3. People (Jew and Gentile) were kept under the Law ("Old" Covenant) until the Faith in Christ was come.
Galatians 3:23

Gal 3:23- But before faith came, we were kept in ward under the law, shut up unto the faith which should afterwards be revealed. ASV

  4. The Law ("Old" Covenant) had been added by God because of sins.
"Galatians 3:19"

Gal 3:19- What then is the law? It was added because of transgressions, till the seed should come to whom the promise hath been made; and it was ordained through angels by the hand of a mediator. ASV

  5. Jesus spoiled principalities and powers.
"Colossians 2:15"

(Col 2:15)- having despoiled the principalities and the powers, He made a show of them openly, triumphing over them in it. ASV

  6. We are now no longer under the Old Covenant, including the sabbath law which was just a shadow.
"Colossians 2:16, 17"

Col.2: 16 Let no man therefore judge you in meat, or in drink, or in respect of a feast day or a new moon or a sabbath day: 17- which are a shadow of the things to come; but the body is Christ`s. ASV

  7. We are not to "hear" Moses or the Old Covenant prophets; we are to "hear" Jesus.
"Hebrews 1:1-2"

Heb 1:1,2 God, having of old time spoken unto the fathers in the prophets by divers portions and in divers manners, hath at the end of these days spoken unto us in his Son, whom he appointed heir of all things, through whom also he made the worlds; ASV