Muwatta Malik, Book 20, Hadith 70 (USC-MSA)

Yahya related to me from Malik, from Rabia ibn Abi Abd ar-Rahman, from Sulayman ibn Yasar, that the Messenger of Allah, may Allah bless him and grant him peace, sent Abu Rafi and a man of the Ansar to arrange his marriage to Maymuna bint al-Harith, and the Messenger of Allah, may Allah bless him and grant him peace, was in Madina before he had left for umra.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم بَعَثَ أَبَا رَافِعٍ وَرَجُلاً مِنَ الأَنْصَارِ فَزَوَّجَاهُ مَيْمُونَةَ بِنْتَ الْحَارِثِ وَرَسُولُ اللَّهِ صلى الله عليه وسلم بِالْمَدِينَةِ قَبْلَ أَنْ يَخْرُجَ ‏.‏

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also referenced under: Book 20, Hadith 774 (In-Book)