'Root' in the Bible

"Even now the axe lies at the root of the trees. Therefore, every tree that doesn't bring forth good fruit is cut down, and cast into the fire.

When the sun had risen, they were scorched. Because they had no root, they withered away.

yet he has no root in himself, but endures for a while. When oppression or persecution arises because of the word, immediately he stumbles.

"But he said, 'No, lest perhaps while you gather up the darnel weeds, you root up the wheat with them.