Ibn Jurayj (may Allah have mercy on him) said concerning the saying of Allah Almighty: "Women are not lawful for you after this, nor that you exchange them for other wives" [Surah al-Ahzab: 52], that Sayyidah Aishah (may Allah be pleased with her) used to say: The Prophet (peace and blessings be upon him) did not pass away until Allah Almighty made it lawful for him to marry; and those (women) were made lawful who had emigrated with him (peace and blessings be upon him), and this is clear in the verses.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13349