Ibn Abi Mulaykah (may Allah have mercy on him) narrates from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) married while in the state of ihram.
A group narrated it from Abu Asim in this way, but it is only narrated from Ibn Abi Mulaykah as mursal, and the mention of Aishah (may Allah be pleased with her) in it is an error. Abu Isa al-Tirmidhi said: I asked Muhammad bin Isma'il al-Bukhari (may Allah have mercy on him) about this hadith, and he said: They narrate this hadith from Ibn Abi Mulaykah as mursal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14211