Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) says: We set out (for Hajj) with the Messenger of Allah (peace and blessings be upon him) when five days of Dhu al-Qa'dah remained, and we entered Makkah when four days of Dhu al-Hijjah had passed. Then Sayyiduna Suraqah bin Malik bin Ju'shum (may Allah be pleased with him) said: O Messenger of Allah, is this mut'ah specifically for us, or forever? He (peace and blessings be upon him) said: "No, rather forever; Umrah has entered into Hajj until the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6552