Bulugh al-Maram, Book 11, Hadith 1328 (English)

Ibn 'Umar (RAA) narrated, 'The Messenger of Allah sent a Sariyah (a small army for Jihad) to Najd, and I was among them. They got many camels as spoils and each one's share was twelve camels, and they were given an additional camel each.'. Agreed upon.

وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { بَعَثَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-سَرِيَّةٍ وَأَنَا فِيهِمْ, قِبَلَ نَجْدٍ, فَغَنِمُوا إِبِلاً كَثِيرَةً, فَكَانَتْ سُهْمَانُهُمْ اِثْنَيْ عَشَرَ بَعِيراً, وَنُفِّلُوا بَعِيراً بَعِيراً } مُتَّفَقٌ عَلَيْهِ 1‏.‏ ‏1 ‏- صحيح.‏ رواه البخاري ( 3134 )‏، ومسلم ( 1749 )‏.‏

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also referenced under: Book 11, Hadith 1302 (In-Book)