サヒーフ・アル＝ブハーリー #56
Sahih (Authentic)
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
伝承の連鎖（イスナード）
Narrated Sa'd bin Abi Waqqas