'Reward' in the Bible

Now he that planteth and he that watereth are one: but each shall receive his own reward according to his own labor.

If any man's work shall abide which he built thereon, he shall receive a reward.

For if I do this of mine own will, I have a reward: but if not of mine own will, I have a stewardship intrusted to me.

What then is my reward? That, when I preach the gospel, I may make the gospel without charge, so as not to use to the full my right in the gospel.