'Thereof' in the Bible

What soldier ever serveth at his own charges? who planteth a vineyard, and eateth not the fruit thereof? Or who feedeth a flock, and eateth not of the milk of the flock?

And I do all things for the gospel's sake, that I may be a joint partaker thereof.

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

Now ye are the body of Christ, and severally members thereof.