'Expense' in the Bible

Brothers, I have applied all this to Apollos and myself for your benefit, so that you may learn from us not to go beyond what the Scriptures say. Then you will stop boasting about one person at the expense of another.

Have we not the right to our food and drink [at the expense of the churches]?

Who ever goes to war at his own expense? Who plants a vineyard and does not eat its fruit? Or who shepherds a flock and does not drink the milk from the flock?

What then is my reward? [Just this:] that, when I preach the gospel, I may offer the gospel without charge [to everyone], so as not to take advantage of my rights [as a preacher and apostle] in [preaching] the gospel.