Romans 11:20-23

20Well said. Because of unbelief they were broken off, and you stand by faith. Do not be haughty, but fear.

21For if God did not spare the natural branches, He may not spare you either.

22Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness, if you continue in His goodness. Otherwise you also will be cut off.

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