4 Bible Verses about Branches, Figurative Uses

"I am the vine; you people are the branches. The person who remains united to me, and I to him, will bear much fruit. For you cannot do anything if [you are] separated from me. If a person does not remain united to me, he will be thrown out as a [fruitless] branch and dried up. People gather up such branches and throw them into the fire to be burned [as fuel ?].

And if the first part of the dough is dedicated to God, the entire batch of dough will be also. And if the roots [of a tree] are dedicated to God, the branches will be also. But some of the branches [of a cultivated olive tree] were broken off [i.e., God's rejection of the Jews] and you [Gentiles], representing a wild olive tree [branch], were grafted into it. So then, you [Gentiles] were able to benefit from the roots and sap of the olive tree, along with the Jews. Therefore, you should not brag [about your superiority] over the [natural] branches [i.e., the rejected Jews]. But, if you must brag, it should not be over you [Gentiles] nourishing the roots [i.e., the Jews], but over the roots nourishing you.read more.
But you [Gentiles] will then say, "The branches were broken off so that we could be grafted in."

And if the first part of the dough is dedicated to God, the entire batch of dough will be also. And if the roots [of a tree] are dedicated to God, the branches will be also.

For if God did not spare the natural branches [i.e., the Jews], He will not spare you [Gentiles] either.