Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: When the Prophet (peace and blessings be upon him) spoke, it seemed as though light was coming out from between his two front teeth.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Abd al-Aziz bin Abi Thabit, and he is da'if (weak).