Sahih Muslim 2984 a

The Prophet (ﷺ) said, "While a man was walking through a barren land, he heard a voice coming out of a cloud saying: 'Irrigate the garden of so-and- so.' Thereupon the cloud drifted in a certain direction and discharged its water over a rocky plain. The streamlets flowed into a channel. This man followed the channel until it reached a garden and he saw the owner of the garden standing in its center, working with his spade spreading the water (changing the course of the water). He asked him: "O slave of Allah, what is your name?" He told his name, which was the same that he heard from the cloud. The owner of the garden then asked him: "O slave of Allah, why did you ask my name?" He replied: "I heard a voice from a cloud which poured down this water saying: 'Irrigate the garden of so-and-so.' I would like to know what do you do with it." He said: "Now that you asked me, I will tell you. I estimate the produce of the garden and distribute one-third of it in charity, I spend one-third on myself and my family and invest one-third back into the garden." <b>[Muslim]</b>.

He said that the Prophet (ﷺ) told of a man in a waterless plain hearing a voice from a cloud say, “Water so and so’s garden.” Those clouds then moved away and emptied their water on a lava tract, and a channel collected the whole of that water. He followed the water and came upon a man standing in his garden diverting the water with his spade. He asked him his name, and when he told him, it was the very name he had heard from the cloud. The man then asked him why he had asked his name, and he replied that he had heard a voice from the clouds from which that water had come saying, “Water so and so’s garden," using his name. He then asked him what he was doing in the garden and he replied, “Since you have said this, I am waiting for what it produces, when I shall give a third as <i>sadaqa</i>, use a third as food for myself and my family, and put a third back into it.” Muslim transmitted it.