Allah the Almighty reminds us in the

Holy Qur'an:

"The similitude of those who spend their wealth for the cause of Allah is like the similitude of a grain of corn which grows seven ears, in each ear a hundred grains. And Allah multiplies it further for whomsoever He pleases. And Allah is Bountiful, All-Knowing."

(Surah Al-Baqarah, 2:262)