Romans 11:25-27 For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. And so all Israel will be saved, as it is written: "The Deliverer will come out of Zion, and He will turn away ungodliness from Jacob; for this is My covenant with them, when I take away their sins."
Note: Amillennialists never make a distinction between individual Jews and the nation.
BIBLICAL STUDIES IN FINAL THINGS - William E. Cox
Pages 50-51: One premise by futurists and dispensationalists is that all promises to national Israel were unconditional, and that they are binding upon God regardless of the actions of the nation Israel. Here especially the student of the Bible needs to search out the spirit of the Old Testament and not to become enmeshed in the letter. Many Jews of Jesus' day had made this mistake, and the result was their total blindness to Jesus' teachings. Certainly John the Baptist recognized conditions to be binding upon Israel. The fact is recorded in Matthew 3:7-12 that John recognized one such condition to be fruit-bearing. John refused even to baptize the leaders of Israel unless they showed evidence of meeting this condition - "Bring forth therefore fruit worthy of repentance." (vs. 8)
THE ISRAEL OF GOD IN PROPHECY - Hans K. LaRondelle
Page 131: Can the words of Paul, "And so all Israel shall be saved" (Romans 11:26) be construed to teach the restoration of Israel's theocracy in Palestine? The New Scofield Reference Bible seems to say this in its comments on Romans 11:26, "According to the prophets Israel, regathered from all nations, restored to her own land and converted, is yet to have her greatest earthly exaltation and glory" (p. 1226). Paul appeals to the Old Testament in order to substantiate his challenging statement: As it is written: "The deliverer will come from Zion; he will turn godlessness away from Jacob. And this is my covenant with them when I take away their sins" (Romans 11:26, 27). Through the living witness of gentile Christians, many Jews will come to faith in Christ and thus be regrafted into the true Israel of God (Romans 11:23). Israel is thus saved in the same way as the Gentiles are saved ("so," Romans 11:26).
Amillennialists are correct in stating that every individual must receive Jesus Christ into their lives through faith in order to be saved. (John 1:12-13; Galatians 3:23-29) Accordingly, God shows no partiality with individuals in regards to eternal life. (Romans 2:11-16; John 3:14-16)
However, amillennialists are incorrect when they link individual responsibility with the nation of Israel. For example, amillennialists will generally avoid Zechariah's prophecy concerning the siege of the city of Jerusalem as found in the first eight verses of chapter 14. Here are some questions that amillennialists can not honestly answer. Has all the nations laid siege to Jerusalem at one time? (verse 2) Did Jesus fight against the nations at that time? (verse 3) Has Jesus created a valley from the splitting of the Mount of Olives? (verse 4) Did the surviving remnant of Jerusalem flee through this valley? (verse 5) Was the sun and moon darkened during that particular day? (verse 6) Was there light at Jerusalem during the evening at that time? (verse 7) When have rivers of water flowed from Jerusalem? (verse 8) Unless Zechariah is a false prophet, all the nations of the earth will go up to Jerusalem to worship Jesus Christ as "King over all the earth." (Zechariah 14: 9, 16-17).