Mishkat al-Masabih 2659

Wabisa b. Ma'bad reported God’s Messenger as saying, “Have you come to ask about righteousness and sin, Wabisa?” When he replied that he had, he joined his fingers and striking his breast with them said, “Ask yourself for a decision, ask your heart for a decision (saying it three times). Righteousness is that with which the soul is tranquil and the heart is tranquil, but sin is that which rouses suspicion in the soul and is perplexing in the breast, even if people give you a decision in its favour.” Ahmad and Darimi transmitted it.