'Root' in the Bible

And if the firstfruit is holy, so is the lump: and if the root is holy, so are the branches.

But if some of the branches were broken off, and thou, being a wild olive, wast grafted in among them, and didst become partaker with them of the root of the fatness of the olive tree;

glory not over the branches: but if thou gloriest, it is not thou that bearest the root, but the root thee.

And again, Isaiah saith, There shall be the root of Jesse, And he that ariseth to rule over the Gentiles; On him shall the Gentiles hope.