All Israel will be saved.

Romans 11:25-27

25 Lest you be wise in your own sight, I do not want you to be unaware of this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in.
26 And in this way all Israel will be saved, as it is written, “The Deliverer will come from Zion, he will banish ungodliness from Jacob”;
27 “and this will be my covenant with them when I take away their sins.” – Romans 11:25-27

This passage reflects the question Paul said earlier asking if God had rejected Israel (Romans 11:1). God has allowed the nation of Israel to turn away from Him and their heart has become hard towards God. But, Paul is convinced that one day the nation of Israel will turn to the Lord Jesus Christ and accept that He is their Messiah. The statement “All Israel will be saved” has been debated at length but it is generally believed that this means that the nation of Israel will accept the Lord Jesus as their king – “The Deliverer will come from Zion, he will banish ungodliness from Jacob”. However, there will still be individual Jewish people who may not personally receive Jesus as their saviour. Paul and John the Baptist both stated that being a child of Abraham was not sufficient to enter the Kingdom of Heaven (Romans 9:7, Matthew 3:9). As individual we each have to repent before God and accept Jesus as our saviour. But, it may well be that the majority of the nation of Israel will turn to Christ. God has always had a plan to use Israel as a light to the nations. A beacon drawing the world to God the Father and His Son, Jesus Christ through the power of the Holy Spirit. Jesus wanted Israel to repent and he lamented for Jerusalem:

37 “O Jerusalem, Jerusalem, the city that kills the prophets and stones those who are sent to it! How often would I have gathered your children together as a hen gathers her brood under her wings, and you were not willing!
38 See, your house is left to you desolate.
39 For I tell you, you will not see me again, until you say, ‘Blessed is he who comes in the name of the Lord.'” – Matthew 23:37-39

We are to pray earnestly for peace in Jerusalem:

Pray for the peace of Jerusalem! “May they be secure who love you! – Psalm 122:6

especially as we see the day of the Lord approaching and so many pressures are on the land of Israel now. But may God’s will be done. He wants all Israel to be saved.

1 But now thus says the LORD, he who created you, O Jacob, he who formed you, O Israel: “Fear not, for I have redeemed you; I have called you by name, you are mine.
2 When you pass through the waters, I will be with you; and through the rivers, they shall not overwhelm you; when you walk through fire you shall not be burned, and the flame shall not consume you.
3 For I am the LORD your God, the Holy One of Israel, your Savior. I give Egypt as your ransom, Cush and Seba in exchange for you.
4 Because you are precious in my eyes, and honored, and I love you, I give men in return for you, peoples in exchange for your life.
5 Fear not, for I am with you; I will bring your offspring from the east, and from the west I will gather you. – Isaiah 43:1-5

7 Then Moses summoned Joshua and said to him in the sight of all Israel, “Be strong and courageous, for you shall go with this people into the land that the LORD has sworn to their fathers to give them, and you shall put them in possession of it.
8 It is the LORD who goes before you. He will be with you; he will not leave you or forsake you. Do not fear or be dismayed.” – Deuteronomy 31:7-8