The Messenger of Allah ﷺ sent out a military expedition toward Najd, and Abdullah bin Umar was among them. They captured a large number of camels as spoils, and each man's share came to twelve camels, with one additional camel given to each as a bonus.Ibn Mawhab added that the Messenger of Allah ﷺ did not alter this distribution.
حدثنا عبد الله بن مسلمة القعنبي عن مالك ح و حدثنا عبد الله بن مسلمة ويزيد بن خالد بن موهب قالا حدثنا الليث المعنى عن نافع
أن رسول الله ﷺ بعث سرية فيها عبد الله بن عمر قبل نجد فغنموا إبلا كثيرة فكانت سهمانهم اثني عشر بعيرا ونفلوا بعيرا بعيرا زاد ابن موهب فلم يغيره رسول الله ﷺ
It was narrated by Bukhari in Fard al-Khumus, chapter "And Among the Evidence That Khumus Is for Emergencies, etc.," no. 3134, and by Muslim in al-Jihad wal-Sayr, chapter al-Anfal, no. 1749, from the hadith of Malik al-Muslimin, 2/450, no. 1000, with my verification, and it is also found in Muwatta.