Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: When the Prophet (peace and blessings be upon him) married Lady Maymunah (may Allah be pleased with her), he (peace be upon him) was not in the state of ihram at that time.
Hadith Referenceسنن الدارقطني / كتاب النكاح / 3653
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 3653 ، انفرد به المصنف من هذا الطريق»