Sunan An-Nasa'i

It was narrated from 'Abdullah bin 'Amr, who attributed it to the Messenger of Allah:""There is no person who kills a small bird or anything larger, for no just reason, but Allah will ask him about it."" It was said: ""O Messenger of Allah, what does 'just reason mean?"" He said: ""That you slaughters it and eat it, and o not cut off its head and throw it aside