It is narrated from Hazrat Amr bin Yathrabi Zumri that I was present in that sermon of the Prophet (peace be upon him) which he delivered in the plain of Mina. Among other things, the Prophet (peace be upon him) said in this sermon that it is not lawful for any person to take his brother's wealth except with his heart's content and permission. Upon hearing this, I submitted in the presence of the Messenger (peace be upon him), "O Messenger of Allah, tell me, if I find my cousin's herd and take a goat from it, will I be sinful in this?" The Prophet (peace be upon him) replied, "If you find such a sheep that can bear a knife and a flint, then do not even touch it."