Fath al-Rabbani

It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), he says: I said, O Messenger of Allah! The wealthy people perform prayers, fast, and perform Hajj, thus they are advancing in reward. You (peace and blessings be upon him) said: You also fast, perform prayers, and perform Hajj. I said: Yes, but they give charity and we cannot give charity. You (peace and blessings be upon him) said: There are also forms of charity within you, for example, removing a bone from the path is charity, guiding someone on the road is charity, helping the weak with your extra strength is charity, clarifying on behalf of one who cannot speak clearly is charity, and having intercourse with your wife is charity. I said: O Messenger of Allah! Is it possible that we fulfill our desire and there is reward for us in it? You (peace and blessings be upon him) said: Tell me, if you were to use that private part in something unlawful, would you be sinful? I said: Yes. You (peace and blessings be upon him) said: Then when you avoid evil with the intention of reward, and do a good deed with the intention of reward, will you not be rewarded?