It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that a man from Banu Zuhrah met Sayyiduna Umar (may Allah be pleased with him) before he accepted Islam, while he was going along with a sword hung at his side. He asked: O Umar! Where are you headed? He said: I intend to kill Muhammad (peace and blessings be upon him). He said: Shall I not tell you something astonishing? Your brother-in-law Sa'id and your sister have turned away from their religion and abandoned the religion they were upon. Hearing this, Umar set off towards them, filled with rage. When he came near the door, there was a man with them named Khabbab (may Allah be pleased with him), who was teaching them Surah Ta-Ha. When Khabbab sensed the sound of Umar, he hid under their bed. Umar entered and asked: What was this murmuring that I heard with you? They both replied: It was only something we were talking about between ourselves. Umar said: Perhaps you two have turned away from your religion and abandoned what you were upon before. Then his brother-in-law Sa'id bin Zayd (may Allah be pleased with him) said: O Umar! What do you think if the truth lies somewhere other than in your religion? Hearing this, he fell upon his brother-in-law and beat him severely. His sister tried to save her husband from him, so he struck her on the face, which made her face bleed. His sister said (with great courage): What do you think if the truth lies somewhere other than in your religion? I bear witness that there is no true god except Allah, and I bear witness that Muhammad is the Messenger of Allah. The narrator says: Seeing this, Umar fell silent. Then his sister said: Get up and take a ritual bath (ghusl) or perform ablution (wudu).

It is narrated from Sayyiduna Umar (may Allah be pleased with him) that when my sister opened (the door) for me, I said: "O enemy of your own self! Have you abandoned your religion?" She said something (in reply), and then she said: "O son of al-Khattab! Do whatever you intend to do, for I have already accepted Islam." Umar says: Then I went in and sat on the couch, and suddenly I saw a written sheet in the middle of the house. I asked: "What is this sheet doing here?" She said: "O son of al-Khattab! Leave us alone. You neither take the ritual bath after major impurity (janabah) nor purify yourself, whereas this may be touched only by those who are pure." Mention of Sayyidah Asma' bint Sa'id bin Zayd bin Amr bin Nufayl, who is the daughter of Sayyidah Fatimah bint al-Khattab (may Allah be pleased with her).