It is narrated from Sayyiduna Buraidah Aslami (may Allah be pleased with him) that once the Messenger of Allah (peace and blessings be upon him) returned from a battle, and a black slave girl came to him and said: I had vowed that if Allah brought you back safely, I would play the drum (duff) before you. The Prophet (peace and blessings be upon him) said: If you have made this vow, then fulfill it, and if you have not made this vow, then leave this act. So she began to play the duff. In the meantime, Sayyiduna Abu Bakr (may Allah be pleased with him) came, and she kept playing the duff. Some other companions also came, and she continued to play the duff. But later, when Sayyiduna Umar (may Allah be pleased with him) came, she put the duff behind her and started to hide herself. The Messenger of Allah (peace and blessings be upon him) said: O Umar! Indeed, even Satan is afraid of you. I am sitting here, and these people also came, and this slave girl remained busy playing the duff, but when you came, she did this.