Inheritance of Israel

Galatians 3:29 If you belong to  Christ,  then  you  are Abraham’s  seed,  and heirs according  to  the promise

Galatians 4:7 So you are no longer a slave, but a son, and if a son, then an heir through God.

Romans 9: 8 That is, They which are the children of the flesh, these are not the children of God: but the childrenof the promise[the covenant of the promise was with Jacob only]are counted for the seed. ... 13 As it is written, Jacobhave I loved, but Esau have I hated.

Cross-reference with Ephesians 2:12 (ESV), Romans 15:8

Hebrews 9:15 And for this cause he is the mediator of the new testament, that by means of death, for  the redemption of  the  transgressions  that  were  under the  first  testament, they which are called might receive the promise of eternal inheritance. Hebrews 

Israel is promised  eternal  inheritance if their works survive the judgment.