Sayyiduna Abu Dharr Ghifari (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: When you have relations with your wife, you also receive a reward for it. It was asked, "O Messenger of Allah (peace and blessings be upon him)! Do we get a reward even for fulfilling our desires?" The Prophet Muhammad (peace and blessings be upon him) said: Yes, what do you think, if as a result of this relation a child is born to you, who grows up and then passes away, would you hope for reward because of your patience over him? That person replied: Yes. The Prophet Muhammad (peace and blessings be upon him) asked: Did you create that child? He replied: Rather, Allah Almighty created him. The Prophet Muhammad (peace and blessings be upon him) said: Did you grant him guidance? He replied: Rather, Allah Almighty granted him guidance. The Prophet Muhammad (peace and blessings be upon him) asked: Did you provide him sustenance? He replied: Rather, Allah Almighty provided him sustenance. The Prophet Muhammad (peace and blessings be upon him) said: Therefore, use it in a lawful way and avoid the unlawful, and you should maintain it; if Allah Almighty wills, He will give it life, and if He wills, He will give it death, and you will receive a reward.
Hadith Referenceصحیح ابن حبان / كتاب النكاح / 4192
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح لغيره - «الصحيحة» (575).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم