Tertullian

For, as the carnal circumcision, which was temporary, was in wrought for "a sign" in a contumacious people, so the spiritual has been given for salvation to an obedient people; while the prophet Jeremiah says, "Make a renewal for you, and sow not in thorns; be circumcised to God, and circumcise the foreskin of your heart: " and in another place he says, "Behold, days shall come, saith the Lord, and I will draw up, for the house of Judah and for the house of Jacob, a new testament; not such as I once gave their fathers in the day wherein I led them out from the land of Egypt." Whence we understand that the coming cessation of the former circumcision l then given, and the coming procession of a new law (not such as He had already given to the fathers), are announced: just as Isaiah foretold, saying that in the last days the mount of the Lord and the house of God were to be manifest above the tops of the mounts: "And it shall be exalted," he says, "above the hills; and there shall come over it all nations; and many shall walk, and say, Come, ascend we unto the mount of the Lord, and unto the house of the God of Jacob," -not of Esau, the former son, but of Jacob, the second; that is, of our "people," whose "mount" is Christ, "prµcised without concisors' hands, filling every land," shown in the book of Daniel.