It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said that the Messenger of Allah (peace and blessings be upon him) said: "When the ten days of Dhu al-Hijjah begin, whoever intends to offer a sacrifice should not take anything from his hair or his nails."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19866
It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: The Mahdi was mentioned in the presence of the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "He will be from the descendants of Sayyidah Fatimah (may Allah be pleased with her)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19870