'Thereof' in the Bible

Who goeth a warfare any time at his own charges? who planteth a vineyard, and eateth not of the fruit thereof? or who feedeth a flock, and eateth not of the milk of the flock?

And this I do for the gospel's sake, that I might be partaker thereof with you.

For the earth is the Lord's, and the fulness thereof.

But if any man say unto you, This is offered in sacrifice unto idols, eat not for his sake that shewed it, and for conscience sake: for the earth is the Lord's, and the fulness thereof: