النضر بن سويد عن حسين بن موسى عن زرارة عن أحدهما عليهما السلام قال إن علي بن الحسين عليهما السلام تزوج أم ولد عمه الحسن عليه السلام وزوج أمه مولاه فلما بلغ ذلك عبد الملك بن مروان كتب إلى: يا علي بن الحسين كأنك لا تعرف موضعك من قومك وقدرك عند الناس تزوجت مولاة وزوجت مولاك بأمك فكتب إليه علي بن الحسين: فهمت كتابك ولنا أسوة برسول الله صلى الله عليه وآله فقد زوج زينب بنت عمه زيدا مولاه وتزوج مولاته صفية بنت حي ابن اخطب.
12.Al-Naḍr ibn Suwayd narrated from Ḥusayn ibn Mūsā, from Zurārah, from one of them (al-Bāqir or al-Ṣādiq)  who said, “ʿAlī ibn al-Ḥusayn  married the slave wife of his late uncle, al-Ḥasan , and got his mother married to his [manumitted] slave.[1] When ʿAbd al-Malik ibn Marwān heard about that, he wrote to him saying, ‘O ʿAlī ibn al- Ḥusayn, it seems you do not know your position in the eyes of your community and your station among the people! You married a slave woman and got your slave married to your mother?!’ So ʿAlī ibn al- Ḥusayn wrote back to him, ‘I have [read and] understood your letter, yet our exemplar is the Messenger of Allah (ṣ). He married off his own cousin Zaynab to his [freed] slave Zayd, and he himself married his slave maiden Ṣafiyyah bint Ḥayy ibn Akhṭab.’”