It is narrated from Abu al-Bakhtari (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) mentioned various matters for which a person is rewarded, to the point that he receives a reward even for being intimate with his wife. It was asked: O Messenger of Allah, how can that be, when by this act he is merely fulfilling his own desire? He (peace and blessings be upon him) asked: "What do you think: if he did this act in a forbidden way, would he not incur sin?" The Companions said: Yes, certainly he would. He (peace and blessings be upon him) said: "Likewise he is rewarded (for fulfilling his desire in a lawful way)."
From this blessed hadith a great principle is derived: when a person intends, through what is lawful, to avoid what is forbidden and to remain chaste, even his natural and worldly affairs are turned into worship that earns reward.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب النكاح / 1641
Hadith Gradingمحدثین:إسناده مرسل
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :مرسل. » «أخرجه صحيح مسلم برقم: 1006، وأخرجه سنن أبي داود برقم: 1285، 5243، وأخرجه مسند أحمد برقم: 20917، وأخرجه فتح الباري برقم: 807، 6082، وأخرجه المعجم الأوسط للطبراني برقم: 5306»