Forty Hadiths On Ramadan
Hadith No. 23
The Month of Ramadan and Divine Books
Imam Sadiq (A.S.) said: The Torah was revealed on the sixth day of the month of Ramadan, the Bible, on the twelfth night of the month, the Psalms on the eighteenth night of the month and the Quran on the Night of Qadr.
* Al-Kafi, vol. 4, pg. 157*