Muhammad bin Mansur bin Da'ud محمد بن منصور بن داود الطوسي · The Book of Fasting

"When the month of Ramadan beings, the gates of Paradise are opened. The gates of the Fire are closed and the devils are chained up." (Sahih) Abu 'Abdur-Rahman (An-Nasai) said: This meaning, the narration of Ibn Ishaq - is a mistake. Ibn Ishaq did not hear from Az-Zuhri. What is correct is what we mentioned it previously.

"Fasting three days of each month is fasting for a lifetime, and the shining days of Al-Bid, the thirteenth, fourteenth and fifteenth."