1. God’s Eternal Covenant to the Israelites: Christ (Ezk 16:60-63)
    Heb 8:6-13, Heb 13:20, Mt 26:28

In the Old Testament, God gave the Israelites eternal promises. (Ezekiel 16:60-63)

Ezekiel 16:60 Nevertheless I will remember my covenant with thee in the days of thy youth, and I will establish unto thee an everlasting covenant.
61 Then thou shalt remember thy ways, and be ashamed, when thou shalt receive thy sisters, thine elder and thy younger: and I will give them unto thee for daughters, but not by thy covenant.
62 And I will establish my covenant with thee; and thou shalt know that I am the Lord:
63 That thou mayest remember, and be confounded, and never open thy mouth any more because of thy shame, when I am pacified toward thee for all that thou hast done, saith the Lord God.

God has given us a new, everlasting covenant that will not grow old. (Hebrews 8:6-13)

Hebrews 8:6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
7 For if that first covenant had been faultless, then should no place have been sought for the second.
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:
9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
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.

The eternal covenant God has given us is Christ Jesus, who shed His blood to save us. (Hebrews 13:20, Matt 26:28)

Hebrews 13:20 Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep, through the blood of the everlasting covenant,

Matt 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.