Sayyidah Asma' bint Umays (may Allah be pleased with her) said: Ali (may Allah be pleased with him) sent me a proposal of marriage. This reached the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "It is not fitting for her to cause harm to Allah and His Messenger."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20763