Sahih Muslim Book 8, Hadith Number 3283.

Chapter: Mubrim (one who is in the state of Ihram) is forbidden to marry and the disapproval of giving the proposal (in this state).

Ibn Abbas (Allah be pleased with them) reported that Allah’s Apostle (May peace be upon him) married Maimulna in the state of Ihram. Ibn Numair made this addition: “I narrated it to Zuhri and he said: Yazid b. al-Asamm (Allah be pleased with him) told me that he (the Holy Prophet) married her when he was not a muhrim.”