Zakat (Kitab Al-Zakat)
Dawud :: Book 9 : Hadith 1674
Narrated Umar ibn al-Khattab:
The Apostle of Allah (peace_be_upon_him) commanded us one day to give sadaqah. At that time I had some property. I said: Today I shall surpass AbuBakr if I surpass him any day. I, therefore, brought half my property. The Apostle of Allah (peace_be_upon_him) asked: What did you leave for your family? I replied: The same amount. AbuBakr brought all that he had with him. The Apostle of Allah (peace_be_upon_him) asked him: What did you leave for your family? He replied: I left Allah and His Apostle for them. I said: I shall never compete you in anything.