A man was in an open land, far from any town, when he heard a voice from within a cloud saying: "Water the garden of so-and-so." The voice named a particular person.
The cloud moved away and poured its water on a harra, a rocky area of dark stones. One of the channels there took in all of that water.
The man followed the water and found another man standing in his garden, turning the water with a spade.
He asked him: "O servant of Allah, what is your name?" The garden owner gave the very name the man had heard in the cloud. He asked: "Why do you ask me my name?"
The man explained that he had heard a voice in the cloud that this water came from, saying "Water the garden of so-and-so", using his name. Then he asked: "What do you do with it?"
The garden owner answered: since you ask, I look at what comes out of it. I give a third in charity, my family and I eat a third, and I return a third to it.
In the second narration in Sahih Muslim (2984b), the charity part is described as a third that he puts for the poor, for those who ask, and for the traveller in need.