Musannaf Ibn Abi Shayba 16:1026

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hammad ibn Salamah, from Umm Shabib, from Umm ‘Amr, that the wife of al-Zubayr said: I heard ‘Umar saying: "O assembly of women, conceal the henna, and raise the veil." And I heard him saying: "I adjure by Allah any woman who prays in the Hijr."