Al-Baqarah 2:265

Wamathalu allatheena yunfiqoona amwalahumuibtighaa mardati Allahi watathbeetan minanfusihim kamathali jannatin birabwatin asabaha wabilunfaatat okulaha diAAfayni fa-in lam yusibhawabilun fatallun wallahu bimataAAmaloona baseer

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.

The example of those who spend their wealth to seek the pleasure of Allah and to make firm (their faith) from (the depths of) their souls is like a garden on a foothill on which came a heavy rain, and it yielded its produce twofold. Even if a heavy rain does not come to it, a light drizzle is enough, and Allah is watchful of what you do.