Say: “Truly, my Lord enlarges the provision for whom He wills of His slaves, and (also) restricts (it) for him, and whatsoever you spend of anything (in Allâh’s Cause), He will replace it. And He is the Best of providers.”[Surah Saba, Verse 39]
Abu Hurayrah Radhiyallahu Anhu said that the Prophet (Peace be upon him) said:“ Allah has said: ‘O Son of Adam! Spend, I will spend on you!” [Sahih Muslim (2/690)]
The Prophet (Peace be upon him) said:“There is not a single day in which a servant wakes that two angels come down (from the Heavens). One of them says, O’ Allah! Give to the one that spends a substitute (for what he has spent). And the other one says, ‘O Allah! Give to the one that withhold some (his money) destruction!” [Al-Bukhari #1442]
The Prophet (Peace be upon him) said,“While a person was in an open area of land, he heard voice in a cloud above him say. “water the garden of so-and-so!” So the cloud immediately departed, and started pouring its rain out on a rocky plain. A large crevice in the rocks collected all of this water. So the man followed the water (in its course), and he found a man standing in his garden, using an instrument to direct this water in different directions *(to irrigate his garden). He said to him, ‘O servant of Allah! What is your name?’ The man said ‘So-an-so,’ the same name that he had heard in the clouds! Then the man asked him, ‘O servant of Allah! Why are you asking me my name?’ So he responded. ‘I heard a voice in the clouds- the same clouds that this water came from- saying, “water the garden of so-and-so” with your name. What do you interpret this as (i.e. why do you think this happened )?’ So he said, ‘If you say this (i.e. if what you say occurred), then (the reason for this is that) I see what (crops) come out of it (this garden), and I give one third in charity, and I eat with my family one third of it, and I return one third of it (to cultivate more crops)”” and in another narration, it is reported that he said, …and I give one third of it to the poor, and the beggars, and the wayfarers.’ [Muslim (4/2288)]