サヒーフ・アル＝ブハーリー #55
Sahih (Authentic)
The Prophet (ﷺ) said, "If a man spends on his family (with the intention of having a reward from Allah) sincerely for Allah's sake then it is a (kind of) alms-giving in reward for him
伝承の連鎖（イスナード）
Narrated Abu Mas'ud