الكافي 2/1/75/5

5. Ali ibn Ibrahim has narrated from his father from Hammad ibn ‘Isa from Ibrahim ibn ‘Umar al-Yamani from Abu ‘Abdillah عليه السلام who has said the following: “Of the rights of the Muslim on the Muslim is that he must not satisfy himself with food while his Muslim brother is hungry. One must not satisfy himself with water while one’s Muslim brother is thirsty, and one must not dress up in finery while his Muslim brother is in need of clothes. How great is the right of the Muslim on his Muslim brother! The Imam then said, ‘Love for your Muslim brother what you love for yourself. Ask him when you need him and when he needs you, you must help him and do not frustrate him, but be his supporter; he is your supporter. When he is absent protect his interests in his absence and when he is present visit, honor and respect him; you are from him and he is from you. If he is disappointed with you do not keep away from him before asking him to forgive you and if he gains something, thank Allah for it. If he suffers from something then support him. If he is subjected to a plot, assist him. If a man says to his brother, fie up on you, the relation of guardianship between them remains no longer. If he says, ‘You are my enemy, one of them will become an unbeliever. If he accuses him, belief in his heart melts like salt melts in water.’ The narrator has said that it is reported to me that the Imam said, ‘The light of the believer shines to the inhabitants of the heavens like the stars shine to the inhabitants of earth.’ And he said, ‘The believer is the friend of Allah Who helps him and grants him favors. He does not say about Him but the truth and he is not afraid of any one other than Him.’”