'Root' in the Bible

And already the axe [of God’s judgment] is swinging toward the root of the trees; therefore every tree that does not bear good fruit is cut down and thrown into the fire.

But when the sun rose, they were scorched; and because they had no root, they withered away.

yet he has no [substantial] root in himself, but is only temporary, and when pressure or persecution comes because of the word, immediately he stumbles and falls away [abandoning the One who is the source of salvation].

But he said, ‘No; because as you pull out the weeds, you may uproot the wheat with them.