His paternal brothers, born to his stepmother Umm Kulthum bint Jarwal, were Zayd and Ubayd Allah.

[3]: 204 It was said that the young Abd Allah had vivid memories of his father's conversion to Islam.

[4]: 950  He remembered following his father around the town as Umar declared his conversion to the neighbours and on the steps of the Kaaba.

[4]: 950  Before the Battle of Uhud in March 625, Muhammad called Abd Allah Ibn Umar, who was then fourteen years old, to present himself.

Two years later, as the Battle of the Trench approached, Muhammad again called Abd Allah, and this time he decreed that he was old enough because he was mature and reached puberty.

[7] He was enlisted in the last army prepared by Muhammad for the expedition of Usama bin Zayd.

[11]: 452 Ibn Umar participated in battles in Iraq, Persia and Egypt, but he remained neutral throughout the first Fitna.