The son of Sabit. A celebrated poet in the time of Muhammad, who embraced Islam. He is said to have lived 120 years, 60 of which were passed in idolatry and 60 in Islam.
It is related in the Traditions that the Prophet on the day of battle with the Banu Quraizah, cried out, “O Hassan ibn Sabit, abuse the infidels in your verse, for verily Gabriel helps you!” (Mishkat, book xxii ch. ix. pt. 1.) [POETRY.]
Based on Hughes, Dictionary of Islam