'Olive tree' in the Bible

And if certain of the young shoots were broken off, and thou, being a wild olive tree, wert grafted in them, and wert a partaker of the root and fatness of the olive tree;

For if thou according to nature wert cut out of the wild olive tree, and against nature wert grafted into the cultivated olive tree: how much more these, according to nature, shall be grafted into their own olive tree