It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) led the Asr prayer. When he (peace and blessings be upon him) was in the fourth rak'ah, Sayyiduna al-Hasan and Sayyiduna al-Husayn (may Allah be pleased with them both) came and climbed onto the back of the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) set the two of them down in front of him; then Sayyiduna al-Hasan (may Allah be pleased with him) came forward (again), so he (peace and blessings be upon him) lifted Sayyiduna al-Hasan (may Allah be pleased with him) onto his right shoulder and Sayyiduna al-Husayn (may Allah be pleased with him) onto his left shoulder, and then said: "O people, shall I not tell you about those who are the best of all people in respect of maternal grandfather and maternal grandmother? Or shall I not tell you about those who are the best of all people in respect of paternal uncle and paternal aunt? Shall I not tell you about those who are the best of all people in respect of maternal uncle and maternal aunt? Shall I not tell you about those who are the best of all people in respect of mother and father? They are al-Hasan and al-Husayn (may Allah be pleased with them both). Their maternal grandfather is the Messenger of Allah (peace and blessings be upon him), and their maternal grandmother is Sayyidah Khadijah bint Khuwaylid (may Allah be pleased with her); their mother is Sayyidah Fatimah (may Allah be pleased with her), the daughter of the Messenger of Allah (peace and blessings be upon him), and their father is Sayyiduna Ali bin Abi Talib (may Allah be pleased with him); their paternal uncle is Sayyiduna Ja'far bin Abi Talib (may Allah be pleased with him), and their paternal aunt is Sayyidah Umm Hani bint Abi Talib (may Allah be pleased with her); their maternal uncle is Sayyiduna al-Qasim (may Allah be pleased with him), the son of the Messenger of Allah (peace and blessings be upon him), and their maternal aunts are Sayyidah Zaynab, Sayyidah Ruqayyah and Sayyidah Umm Kulthum (may Allah be pleased with them), who are the daughters of the Messenger of Allah (peace and blessings be upon him). Their maternal grandfather is in Paradise, their father is in Paradise, their maternal grandmother is in Paradise; their mother, their paternal uncle and their paternal aunt are in Paradise; their maternal aunts are in Paradise, their maternal uncle is in Paradise, the two of them are also in Paradise, and their sister too is in Paradise."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abd al-Razzaq (may Allah have mercy on him) except Ahmad bin Muhammad bin Amr bin Yunus al-Yamami (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الميم / 6462
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 410، والحاكم فى «المستدرك» برقم: 4822، والترمذي فى «جامعه» برقم: 3784، والطبراني فى «الكبير» برقم: 2682»