Ikrimah (may Allah have mercy on him) said: The people of Madinah asked Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) about a woman who performed tawaf of the House on the Day of Sacrifice (Yawm al-Nahr) and then began menstruating. He said: "She may leave." They said: "We will not accept your view; here is Sayyiduna Zayd bin Thabit (may Allah be pleased with him) giving a fatwa contrary to yours." He said: "When you go to Madinah, ask there." When they went to Madinah, they asked, and they were told about Sayyidah Safiyyah (may Allah be pleased with her). Among those whom they asked was Sayyidah Umm Sulaym (may Allah be pleased with her), and she too told them the matter of Sayyidah Safiyyah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9761