Musnad Ahmad 12:9

Dawud ibn Mihran al-Dabbagh narrated to us, Dawud—meaning al-Attar—narrated to us, from Ibn Khuthaym, from Yusuf ibn Mahak, from Hafsah bint Abd al-Rahman ibn Abi Bakr al-Siddiq, from her father, that the Messenger of Allah (may Allah bless him and grant him peace) said to Abd al-Rahman: "Let your sister ride behind you—meaning Aisha—and let her perform Umrah from al-Tan'im. When you descend with her from the hill, command her to enter into the state of Ihram, for it is an accepted Umrah."