Musannaf Ibn Abi Shaybah 10560 — A slave giving charity: those

Sayyiduna Umayr (may Allah be pleased with him), who was the slave of Abi al-Lahm, said: I was a slave and I used to give charity. I asked the Prophet (peace and blessings be upon him) (or my master asked him) whether I could give charity while my master forbade me. He (peace and blessings be upon him) said: "Whatever you give in charity, its reward is for both of you."