It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that he said: "We set out calling out the Talbiyah aloud for Hajj. Then, when we reached Makkah, the Messenger of Allah (peace and blessings be upon him) ordered us to change it (our ihram) into Umrah, and he (peace and blessings be upon him) said: 'Had I known before about my affair what I came to know later, I would certainly have made it an Umrah; but I have brought the sacrificial animals with me, and I have entered ihram for Hajj and Umrah together (Hajj al-Qiran).'"
Hadith Referenceمسند أبي يعلى الموصلي / مسند أنس بن مالك / 4345
Hadith Takhrij«قال سعيد بن محمد السناري: صحيح دون قوله: (وقرنت الحج والعمرة)» «أخرجه مسند أحمد برقم: 13401، وأخرجه المعجم الأوسط للطبراني برقم: 1073، مسند ابویعلیٰ ترقیم الاثری: 4329»