Musannaf Ibn Abi Shaybah 27002 — Reports on the reward for mercy

Sayyiduna Qurrah (may Allah be pleased with him) said: A man said to the Prophet (peace and blessings be upon him): "I slaughtered a goat while feeling great pity for it," or he said: "Indeed, I felt great pity for the goat when I slaughtered it." At this he (peace and blessings be upon him) said: "Indeed, if you have shown mercy to the goat, Allah will have mercy on you." He said this twice.