'Roots' in the Bible

The ax already lies against the roots of the trees. So every tree not producing good fruit will be cut down and thrown into a fire."

The ones on the stony ground are the people who joyfully welcome the word when they hear it. But since they don't have any roots, they believe for a while, but in a time of testing they fall away.

So the Lord replied, "If you had faith the size of a mustard seed, you could say to this black mulberry tree, 'Be pulled out by the roots and planted in the sea,' and it would obey you.