Sahih Bukhari Volume 2, Book 25, Hadith 1643

وَقَدْ أَخْبَرَتْنِي أُمِّي، أَنَّهَا أَهَلَّتْ هِيَ وَأُخْتُهَا وَالزُّبَيْرُ وَفُلاَنٌ وَفُلاَنٌ بِعُمْرَةٍ، فَلَمَّا مَسَحُوا الرُّكْنَ حَلُّوا‏

And my mother informed me that she, her sister, Az-Zubair and such and such persons had assumed Ihram for 'Umra and after passing their hands over the Corner (the Black Stone) (i.e. finishing their Umra) they finished their Ihram."