The Hadith stating that Al-Isra', Al-Kahf, Ta-Ha, Maryam and Al-Anbiya' are among the first revealed Surahs

Q 3: How authentic is the following Hadith: The Prophet (peace be upon him) said concerning Surahs (Qur'anic chapters) Banu Israel (Al-Isra'), Al-Kahf, Ta-Ha, Maryam and Al-Anbiya': They are among the first revealed Surahs and the first which I memorized from the Qur'an.

A: The Hadith referred to is narrated by Imam Al-Bukhari and is attributed to Ibn Mas`ud (may Allah be pleased with him) as a Hadith Mawquf (words or deeds narrated from a Companion of the Prophet that are not attributed to the Prophet). He (Ibn Mas`ud) said regarding Surahs of Banu Israel, Al-Kahf and Maryam: They (Part No. 3; Page No. 129) are among the first revealed Surahs and the first which I memorized from the Qur'an. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.