Ahmad bin Muhammad, from Ibn Abi Nasr, from Jamil bin Darraj, from Zurarah, from Abu Ja‘far عليه السلام, peace be upon him, who said: I asked Him عليه السلام about a man who prayed five rak‘ahs. Imam عليه السلام said: "If he sat in the fourth rak‘ah for the duration of the tashahhud, then his prayer is complete."