It is narrated from Sayyiduna Husayn bin Ali (may Allah be pleased with them both) that he said: "The Ansar came to pledge allegiance to the Messenger of Allah (peace and blessings be upon him) at al-Aqabah, and he (peace and blessings be upon him) said: 'O Ali, stand up and take their pledge.' He said: 'O Messenger of Allah, on what shall I take their pledge?' He (peace and blessings be upon him) said: 'On (the condition) that Allah will be obeyed and not disobeyed, and that you will protect the Messenger of Allah, his household and his descendants just as you protect yourselves and your own children.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one except Husayn narrated this hadith from Ja'far, and Abdullah bin Marwan is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1745
Hadith Gradingمحدثین:إسناده ضعيف لضعف عبد الله بن مروان
Hadith Takhrij«قال الهيثمي: من طريق عبد الله بن مروان وهو ضعيف وقد وثق «مجمع الزوائد ومنبع الفوائد، ج 6، ص 49»»