'Reward' in the Bible

But the planter and the waterer are one; but each shall receive his own reward according to his own labour.

If the work of any one which he has built upon the foundation shall abide, he shall receive a reward.

For if I do this voluntarily, I have a reward; but if not of my own will, I am entrusted with an administration.

What is the reward then that I have? That in announcing the glad tidings I make the glad tidings costless to others, so as not to have made use, as belonging to me, of my right in announcing the glad tidings.