Romans 3:3; Romans 4:20; Romans 11:20; Romans 11:23

Romans 3:3

3 What then? If some did not believe, their unbelief will not nullify the faithfulness of God, will it?

Romans 4:20

20 yet, with respect to the promise of God, he did not waver in unbelief but grew strong in faith, giving glory to God,

Romans 11:20

20 Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited , but fear;

Romans 11:23

23 And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again.