Abu Huraira reported Allah's Apostle (may peace be upon him) as saying: A man expressed his intention to give charity, so he came out with charity and placed it in the hand of an adulteress. In the morning, the people were talking and saying: charity was given to an adulteress last night. He (the giver of Sadaqa) said: 0 Allah, to Thee be the praise-to an adulteress. He then again expressed his intention to give charity; so he went out with the charity and placed it in the hand of a rich person. In the morning the people were talking and saying: Charity was given to a rich person. He (the giver of charity) said: 0 Allah, to Thee be the praise-to a well-to-do person. He then expressed his intention to give charity, so he went out with charity and placed it in the hand of a thief. In the morning, the people were talking and saying: Charity was given to a thief. So (one of the persons) said: 0 Allah, to Thee be the praise (what a misfortune it is that charity has been given to) the adulteress, to a rich person. to a thief! There came (the angel to him) and he was told: Your charity has been accepted. As for the adulteress (the charity might become the means) whereby she might restrain herself from fornication. The rich man might perhaps learn a lesson and spend from what Allah has given him, and the thief might thereby refrain from committing theft.
Chapter 23:
PROOF OF REWARD FOR THE GIVER OF CHARITY EVEN IF IT GOES INTO THE HANDS OF AN UNDESERVING PERSON
Sahi Muslim, The Book of Zakat