Riyad as-Salihin #1509
The Book of Miscellany
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعن سعد بن أبي وقاص رضي الله عنه في حديثه الطويل الذي قدمناه في أول الكتاب في باب النية أن رسول الله صلى الله عليه وسلم قال له:
" وإنك لن تنفق تبغي بها وجه الله إلا أجرت بها حتى ما تجعل في في امرأتك" ((متفق عليه)).
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.