Romans 11:5-7

It is the same today, for a few of the people of Israel have remained faithful because of God’s grace—his undeserved kindness in choosing them. And since it is through God’s kindness, then it is not by their good works. For in that case, God’s grace would not be what it really is—free and undeserved. So this is the situation: Most of the people of Israel have not found the favor of God they are looking for so earnestly. A few have—the ones God has chosen—but the hearts of the rest were hardened.