I and Ibn `Umar were considered too young to take part in the battle of Badr.
Sahih al-Bukhari Book 64, Hadith 7
← Previous Hadith The believers who failed to join the Ghazwa of Badr and those who took part in it are not equal (in reward).

Sahih al-Bukhari Book 64, Hadith 6 Next Hadith → I and Ibn `Umar were considered too young (to take part) in the battle of Badr, and the number of the Emigrant warriors were over sixty (men) and the Ansar were over 249.

Sahih al-Bukhari Book 64, Hadith 8