The Book of Zakat (Kitab Al-Zakat)

Muslim :: Book 5 : Hadith 2181

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: Of the dinar you spend as a contribution in Allah's path, or to set free a slave, or as a sadaqa given to a needy, or to support your family, the one yielding the greatest reward is that which you spent on your family.