'Reward' in the Bible

Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.

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

For if I do this thing willingly, I have a reward: but if against my will, a dispensation of the gospel is committed unto me.

What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel.