الكافي- ط الاسلامية, volume 5, page 125

5. Ali ibn Ibrahim has narrated from his father from al-Nawfaliy from al-Sakuniy who has said the following: “Abu ‘Abd Allah (a.s.), has said that once a man came to ’Amir al-Mu’minin saying, ‘In my earnings I have been neglectful about lawful and unlawful matters, and I want to repent, but I do not know which item in my possession is lawful and which is not.’ ‘Amir al-Mu’minin (a.s.), said, ‘Give one-fifth of your assets in charity. Allah, most Glorious is whose name, accepts one-fifth of things. The rest of your assets are lawful for you.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

6. Ali ibn Ibrahim has narrated from his father from Ali ibn Muhammad al-Qasaniy from a man whom he has mentioned from ‘Abd Allah ibn al-Qasim al-Ja’fariy who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘The world tried to attract a people with purely lawful matters but they passed (without paying any attention) away. Then it tried to attract another people with lawful and doubtful matters and they said, “We do not need any doubtful matters.” However, they expanded the lawful matters. It then tried to attract another people with unlawful and doubtful matters. They said, “We do not need unlawful matters.” However, they expanded the doubtful matters. It then tried to attract another people with unlawful matters only, and they seek to achieve it but they cannot find. The believing people in this world eat like one living through emergencies.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

7. Ali ibn Ibrahim has narrated from Dawud al-Sarmiy who has said the following: “Abu al-Hassan (a.s.), once said to me, £ 0 Dawud, unlawful earnings do not grow. Even if anything grows, it does not have any blessings for him: what he spends does not bring any reward for him and what he leaves behind becomes his supplies to the fire/”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

8. Muhammad ibn Yahya has said the following: “Once Muhammad ibn al-Hassan wrote to abu Muhammad (a.s.), and asked about the case of a man who buys goods or a slave-girl in exchange for a certain amount of assets from one who plunders people on the road or from a thief; if it is lawful for him to use the benefits, or fruits thereof or marry the slave-girl which he has bought from a thief or road plunderer. He (the Imam) signed the answer that said, ’Nothing is good in whatever originates from an unlawful source; and using such matters is not lawful.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.