“I once heard abu ‘Abd Allah (a.s.), say, ‘Whoever withholds one dirham of right, he ends up spending two dirhams for the cause of falsehood. If one denies payment of one dirham of right on his wealth, Allah makes a snake of fire to curl around him on the Day of Judgment.’ He (the narrator) has said that he asked about a man who is knowledgeable, but has paid his Zakat to undeserving people at a certain time has he to pay it again to the deserving people if he knows them? He (the Imam) said, ‘Yes, he is required to do so.’ I then asked, ‘What should he do if he does not find any deserving people? Thus he did not pay, or he did not know if he owes anything or not, but later finds out that he owes.’ He (the Imam) said, ‘He is required to pay to the deserving people for the past.’ I then asked, ‘What is he required to do if he does not find the deserving people and pays to undeserving people although he had done his best and then found out bad things that he had done.’ He (the Imam) said, ‘He is not required to pay it one more time.’” Zurarah has narrated a similar Hadith, except that if he does his best he becomes free of his responsibility, but if he has fallen short in doing his best to find out proper beneficiary, then he is not free of his responsibility.”