Riyad us-Salihin Hadith 561

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." [Muslim].