Obedience (Ahadith 1156 - 1157)

Narrated Abu Masud Al-Ansar:
Whenever Allah's Apostle (p.b.u.h) ordered us to give in charity, we used to go to the market and work as porters and get a Mudd (a special measure of grain) and then give it in charity. (Those were the days of poverty) and today some of us have one hundred thousand.
Imagine that. Prophet (SAW) encouraged them to spend in the way of Allah which, not to forget, is not something obligatory, and they went out to make money so that they could do sadaqah. O_O I'm surprised. Really. Such obedience!
They spent in the way of Allah, and Allah returned to them manifold. "..and today some of us have one hundred thousand."
The likeness of those who spend their wealth in the way of Allah is that of a grain of corn: it grows seven ears, and each ear has hundred grains. Allah give manifold increase to whom He pleases: and Allah is sufficient for His creatures' needs and He knows all things.
Al-Qur'an 2:261
Narrated 'Adi bin Hatim heard the Prophet saying:
"Save yourself from Hell-fire even by giving half a date-fruit in charity."
What's left to say. Must. Do. Sadaqah.