(64) Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
كتاب المغازى
(12) Chapter
(12) باب
Sahih al-Bukhari 4022 

Narrated Qais:

The Badr warriors were given five thousand (Dirhams) each, yearly. `Umar said, "I will surely give them more than what I will give to others."

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، سَمِعَ مُحَمَّدَ بْنَ فُضَيْلٍ، عَنْ إِسْمَاعِيلَ، عَنْ قَيْسٍ، كَانَ عَطَاءُ الْبَدْرِيِّينَ خَمْسَةَ آلاَفٍ خَمْسَةَ آلاَفٍ‏.‏ وَقَالَ عُمَرُ لأُفَضِّلَنَّهُمْ عَلَى مَنْ بَعْدَهُمْ‏.‏
Reference : Sahih al-Bukhari 4022
In-book reference : Book 64, Hadith 71
USC-MSA web (English) reference : Vol. 5, Book 59, Hadith 357
  (deprecated numbering scheme)