James 3:12
Can the fig tree, my brethren, bear olive berries? either a vine, figs? so can no fountain both yield salt water and fresh.
Cross-reference
Matthew 7:16-20 teaches that trees are known by their fruit, exactly matching James' fig/olive and grape/fig logic.
Matthew 12:33 repeats the tree-and-fruit test: the tree is known by its fruit, parallel to James 3:12.
Luke 6:43 states no good tree bears bad fruit—identical to James' point about consistent fruit production.
Luke 6:44 adds each tree is known by its own fruit, mirroring James' examples of fig and olive trees.
In Genesis 1:11, God establishes that plants produce after their kind—the very principle James uses to argue consistency in speech.
Isaiah 5:2-4 uses vineyard imagery: a vine yielding wild grapes instead of good ones, paralleling James' point about consistent fruit.
Jeremiah 2:21 describes a choice vine turned wild—same principle that fruit reveals the tree's nature.