Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 587
Narrated 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).' "