Romans 11:31

So these also have now been disobedient, that through your mercy they may likewise find mercy.

Romans 10:16

But all have not obeyed the gospel. For Isaiah saith, Lord, who hath believed our report?

Romans 11:15

For if the casting away of them be the reconciling of the world, what will the receiving of them be, but life from the dead?

Romans 11:25

Brethren, I would not that ye should be ignorant of this mystery, (lest ye should be wise in your own conceits) that hardness is in part happened to Israel, till the fulness of the Gentiles be come in:

Treasury of Scripture Knowledge

Summary

Even so have these also now not believed, that through your mercy they also may obtain mercy.

Bible References

Believed

Romans 10:16
But all have not obeyed the gospel. For Isaiah saith, Lord, who hath believed our report?
Romans 11:15
For if the casting away of them be the reconciling of the world, what will the receiving of them be, but life from the dead?