Sahih al-Bukhari Book 69, Hadith 2
Allah's Messenger (ﷺ) said, "Allah said, 'O son of Adam! Spend, and I shall spend on you."
The Prophet (ﷺ) said, "When a Muslim spends something on his family intending to receive Allah's reward it is regarded as Sadaqa for him."
The Prophet (ﷺ) said, "The one who looks after a widow or a poor person is like a Mujahid (warrior) who fights for Allah's Cause, or like him who performs prayers all the night and fasts all the day."