'Reward' in the Bible

Now he who plants and he who waters are the same, but each will receive his own reward according to his own labor.

If any man's work remains which he built on it, he will receive a reward.

For if I do this of my own will, I have a reward. But if not of my own will, I have a stewardship entrusted to me.

What then is my reward? That, when I preach the Good News, I may present the Good News of Christ without charge, so as not to abuse my authority in the Good News.