The scholars define the events behind the decline of the verses of the Qur’an as the sabab nuzul ayah. Knowledge of the sabab nuzul ayah is an important matter that needs to be known by the Muslim community, especially the students of the Qur'an. Al-Fansuri, A. R. when writing Tafsir Tarjuman al-Mustafid has included data on the sabab nuzul ayah in interpreting the holy verses of the Qur'an. Even so, he did not cite clear reference sources for the data and facts stated. Therefore, this study aims to identify the sources of reference for the data related to the sabab nuzul ayah found in the Tafsir Tarjuman al-Mustafid. To find out the source of the data, the researchers used a genetic approach in a comparative study introduced by Goldman (1967). This study also only focuses on the fourth juz' of al-Quran in Tafsir Tarjuman al-Mustafid as an initial effort towards refining the content of the work and then will be expanded to other juz’s. The results of the study found that seven works are referenced by Al-Fansuri, A. R. when discussing the sabab nuzul ayah in Tafsir Tarjuman al-Mustafid, namely Tafsir al-Jalalayn, Tafsir al-Khazin, Tafsir al-Tha'labi, Tafsir al -Wajiz, Tafsir al-Baydawi, Tafsir Mujahid and Tafsir al-Tabari.
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