Musannaf Ibn Abi Shayba 8:2681

Abu Bakr narrated to us, he said: Muhammad ibn Ubayd narrated to us, from Ubayd Allah ibn Umar, from Nafi, from Umm Salamah bint al-Mukhtar, and she was married to a son of Abdullah ibn Umar. She gave birth at Muzdalifah, so Safiyyah stayed behind with her. She did not give birth that night, nor the next day. Then they both came to Mina at night, and they threw the pebbles at the Jamrah. Abdullah did not disapprove of that for them, nor did he command them to make up for anything.