Musannaf Ibn Abi Shayba 10:1124

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Habib ibn Abi Thabit, from Sa’id ibn al-Musayyib; and from Sufyan, from Mansur, from Mujahid, from Sa’id ibn al-Musayyib: That Umar turned back women who were pilgrims or performing Umrah who had gone out while in their waiting period (iddah).