In the Holy Qur'an

And whatever wealth you spend, it is for your own benefit (2:272)

Those of you who have faith and spend (in Allah's way) there is a great reward for them (57:7)

You will never attain piety until you spend out of what you hold dear, and whatever you may spend of anything Allah indeed knows it. (3:92)

In the Traditions

Imam Ali in his will to his son said, "You have in your world that with which you can reform your (eternal) abode, so spend rightfully and do not be a storage place for other's (dues)."