Volume 4, Book 51, Number 11:
Narrated Abu Huraira:
A man asked the Prophet, “O Allah’s Apostle! What kind of charity is the best?” He replied. “To give
in charity when you are healthy and greedy hoping to be wealthy and afraid of becoming poor.
Don’t delay giving in charity till the time when you are on the death bed when you say, ‘Give so
much to so-and-so and so much to so-and so,’ and at that time the property is not yours but it be –
longs to so-and-so (i.e. your inheritors).”