Sahih Bukhari
Fighting for the Cause of Allah (Jihaad)
Volume: 004 / Book Number: 052 / Hadith Number: 94
Narrated Abu Huraira:
The Prophet said, "Whoever spends two things in Allah's Cause, will be called by all the gate-keepers of Paradise who will be saying, 'O so-and-so! Come here.' " Abu Bakr said, "O Allah's Apostle! Such persons will never be destroyed." The Prophet said, "I hope you will be one of them."