Sunan Ibn Majah
Hadith #2000
It 'was narrated from Hisham bin 'Urwah, from his father that 'Aishah used to say:""Wouldn't a woman feel too shy to offer herself to the Prophet?"" Until Aileh revealed; ""You (O Muhammad) can postpone (the turn of) whom you will of them (your wives), and you may receive whom you will.” She said: ""Then I said: 'Your Lord is quick to make things easy for you