Sayyidah Umm Salamah (may Allah be pleased with her) narrates that Sayyidah Zaynab (may Allah be pleased with her), the daughter of the Messenger of Allah (peace and blessings be upon him), was sent by her husband Abu al-As bin al-Rabi' (may Allah be pleased with him) to him (peace and blessings be upon him) to seek protection. She went, and her head appeared out of her room, while he (peace and blessings be upon him) was leading the morning prayer. She said: I am Zaynab, the daughter of the Messenger of Allah (peace and blessings be upon him), and I have given protection to Abu al-As. When he (peace and blessings be upon him) finished the prayer, he said: "I too did not know about what you have heard. Beware! Even the lowest of the Muslims can grant protection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18177