'Olive tree' in the Bible

And if some of the branches were broken off, and thou, being a wild olive tree, were grafted in among them, and became a joint partaker of the root of the fatness of the olive tree,

For if thou were cut from what is by nature a wild olive tree, and were grafted contrary to nature into a cultivated olive tree, how much more will these, the natural ones, be grafted into their own olive tree.