Romans 11:20-24

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

for if God did not spare the natural branches, He will not spare you, either.

See then the kindness and severity of God: to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; for otherwise you too will be cut off.

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

For if you were cut off from what is by nature a wild olive tree, and contrary to nature were grafted into a cultivated olive tree, how much more will these who are the natural branches be grafted into their own olive tree?