Sahih al-Bukhari 5351

Adam ibn Abi Iyas narrated to us: Shuʿbah narrated to us, from ʿAdi ibn Thabit, who said: I heard ʿAbdullah ibn Yazid al-Ansari relate from Abu Masʿud al-Ansari. I asked, “From the Prophet?” He replied, “From the Prophet, peace and blessings be upon him,” who said: “When a Muslim spends on his family while seeking its reward from God, that spending is counted as charity for him.”