Hebrews 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.      Jesus Christ's death made him the mediator of the Current Covenant that God spoke about 3 times in the Bible.

Jeremiah 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and be their God, and they shall be my people.

Jeremiah 31:34 And they shall teach no more every man his neighbor, and every man his brother, saying , Know the Lord: for they all shall know me, from the least of them unto the greatest of them, saith the Lord, and I will forgive their iniquity and I will remember their sins no more.