Riyad as-Salihin #1509
The Book of Miscellany
Sa'd bin Abu Waqqas (May Allah be pleased with him) reported in a Hadith included in the chapter of Intention, that Messenger of Allah (ﷺ) said, "Whatever you spend seeking thereby the Pleasure of Allah, will have its reward, even the morsel which you put in the mouth of your wife"..
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About Riyad as-Salihin
This hadith is #1509 from Riyad as-Salihin, in the Book of The Book of Miscellany. Riyad as-Salihin contains 1,896 hadiths across 20 books.