"I was the first man among the Arabs to shoot an arrow in Allah's cause. I saw that we battled along with the Messenger of Allah(s.a.w) and there was no food for us but Al-Hubla and this Samur, such that one of us would leave droppings like the droppings of a sheep. Then Banu Asad appeared wanting to instruct me in religion. I would be a loser and have wasted my efforts."
Jami` at-Tirmidhi Book 36, Hadith 63