Sahih Bukhari Volume 5, Book 57, Hadith Number 18.

Narated By Abu Huraira : I heard Allah’s Apostle saying, “Anybody who spends a pair of something in Allah’s Cause will be called from all the gates of Paradise, “O Allah’s slave! This is good.’ He who is amongst those who pray will be called from the gate of the prayer (in Paradise) and he who is from the people of Jihad will be called from the gate of Jihad, and he who is from those’ who give in charity (i.e. Zakat) will be called from the gate of charity, and he who is amongst those who observe fast will be called from the gate of fasting, the gate of Raiyan.” Abu Bakr said, “He who is called from all those gates will need nothing,” He added, “Will anyone be called from all those gates, O Allah’s Apostle?” He said, “Yes, and I hope you will be among those, O Abu Bakr.”