James 3:12
Can a fig tree, my Brothers, bear olives? or a vine bear figs? No, nor can a brackish well give good water.
Matthew 7:16-20
By the fruit of their lives you will know them. Do people gather grapes from thorn bushes, or figs from thistles?
Matthew 12:33
You must assume either that both tree and fruit are good, or that both tree and fruit are worthless; since it is by it's fruits that a tree is known.
Luke 6:43-44
There is no such thing as a good tree bearing worthless fruit, or, on the other hand, a worthless tree bearing good fruit.
Romans 11:16-18
If the first handful of dough in holy, so is the whole mass; and if the root is holy, so are the branches.