1) The two 'Eed days, namely: al-Fitr ad al-Adh.haa; as 'Umar ibn al-Khattaab (radhi-yAllaahu 'anhu) said: Verily, the Messenger of Allaah prohibited fasting on these two days, the day of al-Fitr from Ramadhaan and the other day on which you eat whilst carrying out your (hajj) rites)), i.e. 'Eed al-Adh.haa,
[Transmitted by Muslim]
2) The days of Tashreeq, and they are the 11th, 12th and 13th days of Dhul-Hijjah. The Messenger of Allaah (sal-Allaahu 'alayhe wa sallam) sent 'Abdullaah ibn Hudhaafah (radhi-yAllaahu 'anhu) around Minaa saying:Do not fast these days, for indeed they are the days for eating and drinking and remembering Allaah ('Azza wa Jall
[Saheeh, transmitted by Ahmad]
And the ones excused from this prohibition are those who are performing the Tamattu' or al-Qiraan hajj, but have no means to offer the obligatory sacrifice.
3) The menstrual and post partum bleeding days with respect to women.The Messenger of Allaah (sal-Allaahu 'alayhe wa sallam) said: ((Is it not that when she is on her menses, she does not pray nor fast? Then this is the deficiency in her religion?
[Transmitted by al-Bukhaaree]