The 4 Gospels were written TO THE JEWS.
Jesus was sent ONLY TO THE JEWS.
Paul said , several times, "I preach the Gospel to the Jews FIRST, then to the gentiles."
The OLD COVENANT (OLD TESTAMENT) was made with ISRAEL.
and, in the OT, God PROMISED TO THE JEWS..........."Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:"
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Do a search for the word "covenant" in BLUELETTERBIBLE.COM.............there's a ton of verses that mention "covenant".
http://cf.blb.org/search/translationResult...on=KJV&sf=5Strong's Numbers VisibleShow Strong's Help
Jer 31:31 Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
Hbr 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
Hbr 8:13 In that he saith, A new [covenant], he hath made the first old. Now that which decayeth and waxeth old [is] ready to vanish away.
Hbr 12:24 And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than [that of] Abel.