Romans 11:21-25

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?

For I do not want you, brothers and sisters, to be uninformed of this mystery—so that you will not be wise in your own estimation—that a partial hardening has happened to Israel until the fullness of the Gentiles has come in;