Romans 11:31

so they too have now become disobedient, that they also may obtain mercy through the mercy shown to you.

Romans 10:16

But they did not all hearken to the glad tidings. For Isaiah saith, "Lord, who hath believed what he hath heard from us?"

Romans 11:15

For if the rejection of them is the reconciliation of the world, what will the reception of them be, but life from the dead?

Romans 11:25

For I would not have you ignorant, brethren, of this mystery, lest ye should be wise in your own conceits, that blindness hath to some extent come upon Israel, until the fullness of the gentiles shall have 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 they did not all hearken to the glad tidings. For Isaiah saith, "Lord, who hath believed what he hath heard from us?"
Romans 11:15
For if the rejection of them is the reconciliation of the world, what will the reception of them be, but life from the dead?