As for what has been mentioned in his statement: "Except for four Surahs from it (the Quran), which he should not recite until he purifies himself - these are Surah Sajdah of Luqman, Ha Mim Sajdah, Al-Najm (When the star falls), and Iqra’ (Read) - the reasoning behind this is what has been stated: because these Surahs contain obligatory prostrations, and performing prostration is not permissible except for someone purified from impurities, without any disagreement." This interpretation is also supported by evidence.
Commentary #14