Romans 11:6

11:6 And if it is by grace, it is no longer by works, otherwise grace would no longer be grace.

Romans 11:20

11:20 Granted! They were broken off because of their unbelief, but you stand by faith. Do not be arrogant, but fear!

Romans 11:23

11:23 And even they – if they do not continue in their unbelief – will be grafted in, for God is able to graft them in again.