Al-Baqara 2:265

And the likeness of those who spend their wealth, seeking the pleasure of Allah and fortifying their own souls, is that of a garden on a fertile hill[161]; if it is hit by a downpour, it yields double its harvest. And if it is not hit by a downpour, then a drizzle is sufficient. And Allah is All-Seeing of what you do.

[161] Gardens and farms on elevated land are more fertile than lower placed ones. This is the analogy Allah draws of the charity of the sincere. No matter how much it is, it grows and prospers.

And the example of those who spend their wealth seeking means to the approval of Allāh and assuring [reward for] themselves is like a garden on high ground which is hit by a downpour - so it yields its fruits in double. And [even] if it is not hit by a downpour, then a drizzle [is sufficient]. And Allāh, of what you do, is Seeing.

265. And the likeness of those who spend their wealth seeking Allâh’s Pleasure while they in their ownselves are sure and certain that Allâh will reward them (for their spending in His Cause), is the likeness of a garden on a height; heavy rain falls on it and it doubles its yield of harvest. And if it does not receive heavy rain, light rain suffices it. And Allâh is All-Seer (knows well) of what you do.

And the likeness of those who spend their wealth in search of Allah's pleasure, and for the strengthening of their souls, is as the likeness of a garden on a height. The rainstorm smiteth it and it bringeth forth its fruit twofold. And if the rainstorm smite it not, then the shower. Allah is Seer of what ye do.