legally how Jesus won it back

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1 Brothers, my heart’s desire and my prayer to God is for Israel, that they may be saved. 2 For I testify about them that they have a zeal for God, but not according to knowledge. 3 For being ignorant of God’s righteousness, and seeking to establish their own righteousness, they didn’t subject themselves to the righteousness of God. 4 For Christ is the fulfillment of the law for righteousness to everyone who believes. 5 For Moses writes about the righteousness of the law, “The one who does them will live by them.” 6 But the righteousness which is of faith says this, “Don’t say in your heart, ‘Who will ascend into heaven?’ (that is, to bring Christ down); 7 or, ‘Who will descend into the abyss?’ (that is, to bring Christ up from the dead.)” 8 But what does it say? “The word is near you, in your mouth, and in your heart;” that is, the word of faith which we preach: 9 that if you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. 10 For with the heart, one believes resulting in righteousness; and with the mouth confession is made resulting in salvation. 11 For the Scripture says, “Whoever believes in him will not be disappointed.” 12 For there is no distinction between Jew and Greek; for the same Lord is Lord of all, and is rich to all who call on him. 13 For, “Whoever will call on the name of the Lord will be saved.”