Mujahid narrates from Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A dinar that you give to a poor person, a dinar that you give to free a slave, a dinar that you have given in the path of Allah, and a dinar that you have spent on your family: the dinar that you have spent on your family is the greatest in reward."
Muslim recorded it in the Sahih from the hadith of Sufyan al-Thawri.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15697