Sayyiduna Ka'b bin Malik (may Allah be pleased with him) narrates: "A slave girl used to graze my goats. Once a wolf ate one of the goats, so I slapped the slave girl on her face. Then I felt remorse, so I came to the Messenger of Allah (peace and blessings be upon him) and said: 'O Messenger of Allah, if I knew that she was a believer, I would free her.'" The Messenger of Allah (peace and blessings be upon him) said (to the slave girl): "Who am I?" She said: "You are the Messenger of Allah." He (peace and blessings be upon him) asked: "And who is Allah?" She said: "The One who is above the heaven." Then the Messenger of Allah (peace and blessings be upon him) said: "Free her, for she is a believer."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ibn Ajlan except Hatim, and no one narrated it from Hatim except Dawud al-Ja'fari; and it is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) only with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 7561
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 193»