Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) narrates: I said: O Messenger of Allah! Sometimes I take hold of a camel to slaughter it, and then I feel mercy for it. The Prophet (peace and blessings be upon him) said: "If you show mercy to it, Allah Almighty will show mercy to you."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Uthman bin Abd al-Rahman al-Jumahi; Abu Hatim says: His hadith is to be written down, but it is not to be used as evidence.