It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) urged (people) to give charity. A man came and said: I have a dinar. He (peace and blessings be upon him) said: "Spend it on yourself." He said: I have another. He (peace and blessings be upon him) said: "Spend it on your child." He said: I have another. He (peace and blessings be upon him) said: "Spend it on your wife." He said: I have another. He (peace and blessings be upon him) said: "Spend it on your servant." He said: I have another. He (peace and blessings be upon him) said: "You know best (where to spend it)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15734