Romans 11:22-24

22Notice therefore the kindness and harshness of God – harshness toward those who have fallen, but God’s kindness toward you, provided you continue in his kindness; otherwise you also will be cut off.

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

24For if you were cut off from what is by nature a wild olive tree, and grafted, contrary to nature, into a cultivated olive tree, how much more will these natural branches be grafted back into their own olive tree?