Muhammad bin Ja'far bin Muhammad bin Ali bin Husayn (may Allah have mercy on him) states on oath about his father that he narrated to him, from his father, from his grandfather, from Sayyiduna Ali (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) said: "I was born of marriage (a pure line of marriages), and I was not born of fornication (in any way), from Adam (peace be upon him) until the time my father and my mother gave birth to me."
Only Muhammad bin Abi Umar narrated this hadith from Muhammad bin Ja'far bin Muhammad.
Hadith Referenceالمعجم الأوسط / باب العين / 4728
Hadith Gradingمحدثین:فيه محمد بن جعفر بن محمد متكلم فيه، وبقية رجاله ثقات
Hadith Takhrij«قال الهيثمي: وفيه محمد بن جعفر بن محمد بن علي صحح له الحاكم في المستدرك وقد تكلم فيه وبقية رجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 8، ص 214»» «أخرجه ابن حجر فى «المطالب العالية» برقم: 4210»