'Root' in the Bible

If the first piece of dough is holy, the lump is also; and if the root is holy, the branches are too.

But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree,

do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you.

Again Isaiah says,“There shall come the root of Jesse,And He who arises to rule over the Gentiles,In Him shall the Gentiles hope.”