The Messenger of Allah ﷺ sent out a raiding party toward Najd, and Abdullah bin Umar was among them. They captured a great many camels as spoils, so each man's share came to twelve camels, or eleven camels, and they were each given one additional camel as a bonus.
حدثني يحيى عن مالك عن نافع
أن رسول الله ﷺ بعث سرية فيها عبد الله بن عمر قبل نجد فغنموا إبلا كثيرة فكان سهمانهم اثني عشر بعيرا أو أحد عشر بعيرا ونفلوا بعيرا بعيرا