The third view is that combining the two is permissible. This is the view reported from Mālik (1). Its proponents cited as evidence the hadith related by Abū Dāwūd and al-Tirmidhī (2), from Muhammad ibn al-Hanafiyyah, from ‘Alī, who said: “I asked: ‘O Messenger of Allah, if a son is born to me after you, may I give him your name and your kunya?’ He replied: ‘Yes.’” Al-Tirmidhī said: “A good and authentic hadith.”
In Sunan Abī Dāwūd (3), ‘Ā’ishah reported: “A woman came to the Prophet, peace and blessings be upon him, and said: ‘O Messenger of Allah, I have given birth to a boy and named him Muhammad and given him the kunya Abū al-Qāsim. I was told that you dislike this.’ He said: ‘What makes using my name permissible but adopting my kunya forbidden?’ Or: ‘What makes adopting my kunya forbidden but using my name permissible?’” The proponents of this view said: The hadiths prohibiting this are abrogated by these two hadiths.
The fourth view is that adopting the kunya Abū al-Qāsim was prohibited during the Prophet’s lifetime, peace and blessings be upon him, but is permissible after his death. They said: The reason for the prohibition applied only during his lifetime. It is authentically reported in the Sahīh (4), from Anas, who said: “A man called out at al-Baqī‘: ‘O Abū al-Qāsim!’ The Messenger of Allah, peace and blessings be upon him, turned towards him. The man said: ‘O Messenger of Allah, I did not mean you; I was only calling so-and-so.’ The Messenger of Allah, peace and blessings be upon him, said: ‘Use my name, but do not adopt my kunya.’” They further said: The hadith