«أوليس قد جعل الله لكم ما تصدقون به؟ إن بكل تسبيحة صدقة وبكل تكبيرة صدقة وبكل تحميدة صدقة وبكل تهليلة صدقة وأمر بالمعروف صدقة ونهى عن المنكر صدقة وفي بضع أحدكم صدقة قالوا: يا رسول الله أيأتي أحدنا شهوته ويكون له فيها أجر؟ قال: أرأيتم لو وضعها في الحرام أليس كان يكون عليه وزر؟ فكذلك إذا وضعها في الحلال يكون له أجر»
The Prophet (peace and blessings be upon him) said:
"Has Allah Almighty not made for you things which you can give in charity? Indeed, every time you say 'Subhan Allah' (Glory be to Allah) is charity, every time you say 'Allahu akbar' (Allah is the Greatest) is charity, every time you say 'Al-hamdu lillah' (All praise is for Allah) is charity, every time you say 'La ilaha illallah' (There is no god but Allah) is charity, enjoining good is charity, forbidding evil is charity, and even one of you having relations with his wife is charity. The Companions said: O Messenger of Allah, when one of us fulfils his desire, does he get a reward for that too? He (peace and blessings be upon him) said: Tell me, if he were to use it in what is unlawful, would there not be a sin upon him? Likewise, when he uses it in a lawful way, there is a reward for him."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 2588