It is narrated from Hazrat Ibn Abas (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) said to me, "O Ibn Abas! Shall I not tell you about the most excellent words of seeking refuge, with which those who seek refuge do so?" I said, "O Messenger of Allah (peace and blessings be upon him), why not?" He said, "They are two surahs: Surah Al-Falaq and Surah An-Naas."