Allah's Messenger (ﷺ) said, "You will be rewarded for whatever you spend for Allah's sake even if it were a morsel which you put in your wife's mouth."
Reference: Sahih al-Bukhari 56 In-book : Book 2, Hadith 49 USC-MSA web (English) : Vol. 1, Book 2, Hadith 54 (deprecated)
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