Wills (Kitab Al-Wasaya)

Dawud :: Book 17 : Hadith 2860

Narrated AbuSa'id al-Khudri:

The Prophet (peace_be_upon_him) said: A man giving a dirham as sadaqah (charity) during his life is better than giving one hundred dirhams as sadaqah (charity) at the moment of his death.

Source materials are from the University of Southern California MSA site
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