Mishkat al-Masabih 1877 — Benefits of spending in the way of Allah

He said that the Prophet 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 sadaqa, use a third as food for myself and my family, and put a third back into it.” Muslim transmitted it.