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Luke 22:16-20 - The Covenant is everlasting:
For I say to you, that from this time I will not eat it, till it be fulfilled in the kingdom of God. And having taken the chalice, he gave thanks, and said: Take, and divide it among you: For I say to you, that I will not drink of the fruit of the vine, till the kingdom of God come. And taking bread, he gave thanks, and brake; and gave to them, saying: This is my body, which is given for you. Do this for a commemoration of me. In like manner the chalice also, after he had supped, saying: This is the chalice, the new testament in my blood, which shall be shed for you.

Luke 22:16-20 - The Covenant is everlasting:

Genesis 17:7-14 - The Covenant of Circumcision for Jews is also everlasting:
And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.
And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.
And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.
This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.
He that is born in thy house, and he that is bought with thy money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.
And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant.

And thus the Apostle to the Gentiles had his spiritual son Timothy, who was Jewish through his mother but had a Gentile father, circumcised.

Acts.16 Then came he to Derbe and Lystra: and, behold, a certain disciple was there, named Timotheus, the son of a certain woman, which was a Jewess, and believed; but his father was a Greek:
Which was well reported of by the brethren that were at Lystra and Iconium.
Him would Paul have to go forth with him; and took and circumcised him because of the Jews which were in those quarters: for they knew all that his father was a Greek.