Jarir bin Hazim bin Zayd جرير بن حازم بن زيد · The Book of ad-Dahaya (Sacrifices)

"We were with the Mesenger of Allah on a journey, when the Day of Sacrifice came, so we shared a camel among ten men, and a cow among seven."

"I heard Sharid say: 'I herd the Messenger of Allah say: Whoever kills a small bird for no reason, it will beseech Allah on the Day of Resurrection saying: O Lord, so and so killed me for no reason. And he did not kill me for any beneficial purpose."'