The academic study of these texts is the subject of an essay by Jean Jacques Waardenburg that seeks to determine whether there is a standard methodology for writing them. One of these texts states that distinct black and white threads represent the darkness of the night and the lightness of the day, while another notes that Jesus cannot be held accountable for being deified after his death and therefore is not part of the "firewood of hell" made from inanimate objects of worship. These texts are called diraya when they are based on ijtihad, or independent reasoning, and they are called riwaya when they're based on sources like the tabi'un and sahabah. Authors of these texts, exemplified by al-Zamakhshari and al-Tabari, are known as mufassirun. To be considered authoritative, those authors 
The academic study of these texts is the subject of an essay by Jean Jacques Waardenburg that seeks to determine whether there is a standard methodology for writing them. One of these texts states that distinct black and white threads represent the darkness of the night and the lightness of the day, while another notes that Jesus cannot be held accountable for being deified after his death and therefore is not part of the "firewood of hell" made from inanimate objects of worship. These texts are called diraya when they are based on ijtihad, or independent reasoning, and they are called riwaya when they're based on sources like the tabi'un and sahabah. Authors of these texts, exemplified by al-Zamakhshari and al-Tabari, are known as mufassirun. To be considered authoritative, those authors of these texts must have mastered fifteen fields of study, among which are fiqh and classical Arabic. These works include taw'il and tafsir. For 10 points, identify these texts that explain the meaning of passages from the holy book of Islam.