Sahih al-Bukhari, Hadith 55 ⓘ
Narrated Abu Mas'ud: The Prophet 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.
حَدَّثَنَا حَجَّاجُ بْنُ مِنْهَالٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ أَخْبَرَنِي عَدِيُّ بْنُ ثَابِتٍ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ يَزِيدَ، عَنْ أَبِي مَسْعُودٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا أَنْفَقَ الرَّجُلُ عَلَى أَهْلِهِ يَحْتَسِبُهَا فَهُوَ لَهُ صَدَقَةٌ " .
also referenced under: Book 2, Hadith 48 (In-Book) & Volume 1, Book 2, Hadith 52 (USC-MSA)