(318) بَابُ نَفَقَةِ الرَّجُلِ عَلَى أَهْلِهِ
Abu Mas'ud al-Badri reported that the Prophet, may Allah blesshim and grant him peace, said, "When someone spends something on his familyand reckons its reward to be with Allah, then it is sadaqa for him."
Reference: Al-Adab Al-Mufrad 749
In-book reference: Book 32, Hadith 4
English translation: Book 32, Hadith 749