Abu Dawud said "This is good (hasan) tradition."
Abu Dawud said "By this was meant dagger. The weapon used by the Non "“ Arabs in those days was dagger."
In-book : Book 15, Hadith 242
English translation : Book 14, Hadith 2712
15. Jihad (Kitab Al-Jihad)
باب فِي السَّلَبِ يُعْطَى الْقَاتِلُ