Answered by Shaykh Faraz Rabbani
I have heard that it is prohibited to fast after eid for a bunch of days. Could you please explain?
It is impermissible and sinful to fast the Two Eid Days, and the 3 Days After Eid al-Adha [11th, 12th, and 13th of Dhu’l Hijjah].
Abu Sa`id al-Khudri (Allah be pleased with him) reports that, “The Messenger of Allah (blessings and peace be upon him) forbade fasting on two days: the Eid of Fitr and the Eid of Slaughtering.” [Bukhari and Muslim]
And the Messenger of Allah (Allah bless him & give him peace) said, “The days of slaughtering are days of eating, drinking, and remembrance of Allah Mighty and Exalted.” [Muslim]
Imam Ibrahim al-Halabi (Allah have mercy on him) states in Multaqa al-Abhur, in which he gathered the four main primary texts  of the Hanafi school with additions:
“It is unlawful to fast the two Eid Days, and the days of tashriq [f: 11th to 13th of Dhu’l Hijjah].”
Shaykh Zada (Allah have mercy on him) explains in his commentary, Majma` al-Anhur,
“This is because of the transmitted prohibition against fasting these days.” [Halabi/Shaykh Zada, Majma` al-Anhur Sharh Multaqa al-Abhur, 1.232]
The Hanbali Imam Muwaffaq al-Din Ibn Qudama explains in his al-Mughni that,
“There is consensus (ijma`) of the people of knowledge that fasting the two Eid days is interdicted, and forbidden for voluntary, generally vowed, make up, and expiatory fasts.” [Ibn Qudama, al-Mughni, 3.51]
Imam al-Kasani explained in his Bada’i` al-Sana’i`, of which Ibn Abidin said, ‘I have not seen a comparable book among our school’s works,’ [Radd al-Muhtar, 1.68, Bulaq ed.] that the fast itself is valid, as reason would indicate, and the prohibition indicates dislikedness (with validity). [Kasani, Bada’i` al-Sana’i`, 2.78]
And Allah alone gives success.
 These four main primary texts (mutun) are: Imam Quduri’s Kitab, Imam Mawsuli’s Mukhtar, Imam Nasafi’s Kanz al-Daqa’iq, and al-Wiqaya.
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