Sayyiduna Suraqah bin Malik bin Ju'shum (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) addressed us at al-Batha' and said: "Umrah has entered into Hajj until the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6566