Muhammad bin Fadayl bin Ghazwan محمد بن فضيل بن غزوان · The Chapters on Jihad

It was narrated from Sa’ib bin Yazid, if Allah wills, that the Prophet (ﷺ) wore two coats of mail on the Day of Uhud, one over the other.

“O Aktham! Fight alongside people other than your own, it will improve your attitude and make you generous to your companions. O Aktham, the best number of companions is four, the best number of troops on an expedition is four hundred, the best number of an army is four thousand, and twelve thousand will never be overpowered because of their small number.”

It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) forbade traveling with the Qur’an to the land of the enemy, lest the enemy gets hold of it.