الكافي 2/1/75/3

3. It is narrated from him (narrator of the Hadith above) from Ahmad ibn Muhammad ibn ‘Isa from Ali ibn Sayf from his father, Sayf from ‘Abd al-‘Ala’ ibn ‘A’Yun who has said the following: “Once certain individual of our people wrote to Abu ‘Abdillah عليه السلام asking him about certain issues and they ordered me to ask the Imam about the rights of the Muslim on his Muslim brother and I asked the Imam but he did not answer me. When I went to say farewell to him I said, ‘I asked you that question but you did not answer me.’ The Imam said, ‘I am afraid you may disregard them. Of the obligations most pressing that Allah has made obligatory upon His creature are three things: a man’s yielding to justice against his own soul so as not to accept for his brother (in belief) what he does not accept for his own self, to assist his brother with his property and speak of Allah in all conditions. I do not mean thereby, saying, ‘Glory belongs to Allah and all praise belongs to Allah. Truly speaking of and remembering Allah is to stay away from whatever He has prohibited.’”