'Tree' in the Bible

My people get knowledge from their tree, and their rod gives them news; for a false spirit is the cause of their wandering, and they have been false to their God.

I made discovery of Israel as of grapes in the waste land; I saw your fathers as the first-fruits of the fig-tree in her early fruit time; but they came to Baal-peor, and made themselves holy to the thing of shame, and became disgusting like that to which they gave their love.

His branches will be stretched out, he will be beautiful as the olive-tree and sweet-smelling as Lebanon.

As for Ephraim, what has he to do with false gods any longer? I have given an answer and I will keep watch over him; I am like a branching fir-tree, from me comes your fruit.