And seek by means of what Allah has given you the future abode,
and do not neglect your portion of this world...
[The noble Qur'an, Surah al-Qasas (28): 77]

Behold, you are those invited to spend in the Way of Allah:
but among you are some that are miserly.
But any who are miserly are so at the expense of their own souls.
But Allah is free of all wants, and it is you that are needy.
If you turn back (from the Path),
He will substitute in your stead another people;
then they would not be like you!
[The noble Qur'an, Surah Muhammad 47:38]

The Messenger of Allah (sallallahu 'alaihi wa sallam) said that Allah said, "Spend of son of Adam and I shall spend on you." [Bukhari & Muslim]

The companions used to compete regarding charity

Umar said, "The Messenger of Allah (sallallahu 'alaihi wa sallam) ordered us to give charity at a time when I had some money. I said to myself, 'This day, if ever, I will be ahead of Abu Bakr.' I brought half of my money and the Messenger of Allah (sallallahu 'alaihi wa sallam) asked me, 'What have you left for your family?' I said, 'A similar amount.' Abu Bakr brought all he had and the Messenger of Allah (sallallahu 'alaihi wa sallam) asked him, 'What have you left for your family?' He said, 'I left for them Allah and His Messenger.' So, I said to myself, 'I will never compete with you again.'" [Abu Dawud & Tirmidhi]

Ibn 'Umar would spend thirty thousand all in one time, and for the next month he would not afford a piece of meat to eat. [As-Siyar, vol. 3, p. 218]

Ibn 'Umar was once brought twenty-two thousand dinars and did not leave that audience until after he divided it all for charity. [Sifatus-Safwah, vol. 1, p. 571]

Muawiyah sent two barrels containing a hundred and eighty thousand dirhams to Aishah (radhiAllahu 'anha). She asked for a plate and started (scooping and) dividing it out to the people. At night, she said to her servant, 'Bring me my breakfast (as she was fasting).' Her servant brought her some bread and olive oil, and I said to her, 'You did not leave anything from what came to you today, not even a dirham with which we could buy some meat for breakfast.' 'Aishah (radhiAllahu 'anha) replied, 'Had you reminded me, I would have done so!'" [Al-Ihya', vol. 3, p. 262]

Musab bin Umair was killed (in the battle of Uhud). When he was shrouded in the garment when it covered his head, his feet showed, and when it covered his feet, his head showed!

Abdullah bin Mas'ud said, "A dirham that one of you spends while healthy and coveting, that dirham is better than a hundred dirhams he gives away in his will and testament upon his death." [Tanbihul-Ghafilin, p. 245]

Al-Laith bin Sa'd had an income of over eighty thousand dinars a year, yet he also did not have to pay Zakat on it. (He spent all that money before the year had passed.) [Wafayatul-A'yan, vol. 4, p. 130]

And what burden were it on them
if they had faith in Allah and in the Last Day, and
they spent out of what Allah has given them for sustenance?
For Allah has full knowledge of them.
Allah is never unjust in the least degree:
if there is any good (done) He doubles it,
and gives from His own presence a great reward.
[Surah Nisaa 4:39-40]