When the Prophet (peace and blessings of Allah be upon him) returned to Mecca from his trade trip, and Khadija saw a profit and blessing in her money that which she had not seen before, and her hire, Maysara, told her about the qualities of the Prophet pbuh which he had seen during the trade trip, his honesty and wisdom, she spoke with her friend Nafisa bint Minya about her feelings towards the Prophet (peace and blessings of Allah be upon him), so Nafisa went to the Prophet (peace and blessings of Allah be upon him), suggesting to him to marry Khadija, so he accepted, and spoke to his uncles. His Uncles went to Khadija’s uncle and asked for her hand in marriage. Khadija (may Allah be pleased with her) was forty years old, and he did not marry another woman until she died
عندما عاد الرسول صلى الله عليه وسلم إلى مكة ، ورأت خديجة في مالها من الامانة والبركة مالم تر قبل هذا ، وأخبرها غلامها ميسرة بما رأي فيه من فكر راجح ، ونهج أمين ، فتحدثت مع صديقتها نفيسة بنت منية ، بما في نفسها من ناحية الرسول صلى الله عليه وسلم، فذهبت نفيسة إلى الرسول صلى الله عليه وسلم، تفاتحه أن يتزوج خديجة ، فرضي بذلك، وكلم أعمامه، فذهبوا إلى عم خديجة وخطبوها إليه ، وتم الزواج، وكان عمر الرسول صلى الله عليه وسلم، خمسة وعشرون عاما ، وكان عمر خديجة رضي الله عنها أربعين عاما، ولم يتزوج عليها حتى ماتت.