Sincerity
But those who give seeking Allah’s pleasure and with firm faith, their example is like a garden on a fertile hill. When rain falls, it yields double, and even if no rain falls, it still produces.
2:265And 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.