It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that when the statement of Sayyidah Fatimah bint Qays (may Allah be pleased with her) reached him, he said: "We cannot abandon the Book of Allah because of the word of a woman; perhaps she forgot." Likewise, Asbat bin Muhammad narrated it from al-A'mash as mawquf (a statement of Umar), and Ash'ath narrated it from al-Hakam and Hammad, from Ibrahim, from al-Aswad, from Sayyiduna Umar (may Allah be pleased with him), saying in it: "and the Sunnah of our Prophet (peace and blessings be upon him)." Ash'ath bin Sawwar is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15731