The ingrafting of the gentiles
Romans 11: 17-24
Now if some branches have been broken off, and you (gentiles), a wild olive shoot, have been grafted in among the others to share in the nourishment of the olive root, do not boast over those branches. If you do, remember this: You do not support the root, but the root supports you.
You will say then, “Branches were broken off so that I could be grafted in.” That is correct: They were broken off because of unbelief, but you stand by faith. Do not be arrogant, but be afraid. For if God did not spare the natural branches, He will certainly not spare you either.
Take notice, therefore, of the kindness and severity of God: severity to those who fell, but kindness to you, if you continue in His kindness. Otherwise you also will be cut off. And if they do not persist in unbelief, they will be grafted in, for God is able to graft them in again. For if you were cut from a wild olive tree, and contrary to nature were grafted into one that is cultivated, how much more readily will these, the natural branches, be grafted into their own olive tree!