Although scholars including ibn Taymiyyah claim that Muhammad has commented on the whole of the Qur'an, others including Ghazali cite the limited number of narratives, thus indicating that he has commented only on a portion of the Qur'an yet the first and foremost exegesis/tafsir of the Qur'an is found in hadith of Muhammad. Hadīth (حديث) is literally "speech"; recorded saying or tradition of Muhammad validated by isnad; with Sirah Rasul Allah these comprise the sunnah and reveal shariah. According to Aishah, the life of Prophet Muhammad was a practical implementation of the Qur'an. Therefore, a higher count of hadith elevates the importance of the pertinent surah from a certain perspective.