'Root' in the Bible

And now also the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire.

And when the sun was up, they were scorched; and because they had no root, they withered away.

Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.

But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.