'Reward' in the Bible

the spies spotted a man leaving the city. They said to him, "If you show us a secret entrance into the city, we will reward you."

He said to his mother, "You know the eleven hundred pieces of silver which were stolen from you, about which I heard you pronounce a curse? Look here, I have the silver. I stole it, but now I am giving it back to you." His mother said, "May the Lord reward you, my son!"