Muhammad bin Hmyd bin Hyan محمد بن حميد بن حيان · The Book on Jihad

The Prophet (ﷺ) entered (Makkah) during they year of the Conquest, and upon his head was a helmet (Mighfar). It was said to him: 'Ibn Khatal is clinging to the covering of the Ka'bah.' So he said: 'Kill him.'" This Hadith is Hasan Sahih Gharib. We do knot know of anyone important who reported it other than Malik from Az-Zuhri.

That the Messenger of Allah (ﷺ) said: "Hearing and obeying is required from every Muslim man - in what he like and what he dislikes - as long as he is not ordered with disobedience. If he is ordered with disobedience, then no hearing or obeying is required of him." There are narrations on this topic from 'Ali, 'Imran bin Husain, and Al-Hakam bin 'Amr Al-Ghifari. This Hadith is Hasan Sahih.

That Ibn 'Umar said: "I was reviewed before army, and I was fourteen years old, but he did not accept me. Then I was reviewed before him later in army while I was fifteen years old, and he accepted me." Nafi said: "I narrated this Hadith to 'Umar bin 'Abdul-'Aziz and he said: 'This is the limit that distinguishes between youth and manhood.' The he wrote to give salaries to whoever reached fifteen years of age.