Col. 3
Paul directed Christians to do everything “heartily, as unto the Lord.” He then clarified that their reward for doing so would be in their “inheritance.” That speaks of a reward in the hereafter.
Rewards are not always immediate. When we labor, we do it for the right reasons regardless of the pay we receive. God is our owner and He will pay us what’s right. It can be said He is our debtor.
Think about it … who do you want to receive a reward from? … the generous God of Heaven, or an earthly boss who can’t see every effort and motive you employ?