Al-Waqidi said: Saeed Ibn al-Musayyib was one of the most skilled of people in interpreting dreams. He learnt it from Asma bint Abi Bakr al-Siddiq and she learnt it from her father.
Imam al-Dhahabi said in another place:
From Imran bin Abdullah who said: Hasan bin Ali saw that it was as if there was written between his eyes ‘قل هو الله احد’ he and his family took glad tidings from it, and they related it to Saeed bin al-Musayyib. He said: If his dream is true then he has only a little of his life remaining. He (Hasan) passed away after a few days.