Sahih Bukhari Volume 009, Book 093, Hadith Number 587.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 93. Oneness, Uniqueness of Allah (Tawheed)
Narrated By Abu Huraira : Allah's Apostle said, "We (Muslims) are the last (to come) but will be the foremost on the Day of Resurrection." The narrators of this Hadith said: Allah said (to man), 'Spend (in charity), for then I will compensate you (generously).'"