Sahih Muslim , Book 15, Hadith 124 (In-Book) ⓘ
`A'isha (Allah be pleased with her) said: We set out with the Messenger of Allah just at the appearance of the new moon of Dhul- Hijja. We had no other intention but that of performing the Hajj, whereupon the Messenger of Allah said: He who among you intends to put on Ihram for `Umra should do so for `Umra. The rest of the hadith is the same.
وَحَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ خَرَجْنَا مُوَافِينَ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم لِهِلاَلِ ذِي الْحِجَّةِ لاَ نَرَى إِلاَّ الْحَجَّ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ أَحَبَّ مِنْكُمْ أَنْ يُهِلَّ بِعُمْرَةٍ فَلْيُهِلَّ بِعُمْرَةٍ " . وَسَاقَ الْحَدِيثَ بِمِثْلِ حَدِيثِ عَبْدَةَ .
also referenced under: Hadith 1211 (Reference) & Book 7, Hadith 2769 (USC-MSA)