Ibn `Abbas said, `The Appointed Days are the Days of Tashriq (11-12-13th of Dhul-Hijjah) while the Known Days are the (first) ten (days of Dhul-Hijjah).'' `Ikrimah said that:
﴿وَاذْكُرُواْ اللَّهَ فِى أَيَّامٍ مَّعْدُودَتٍ﴾
(And remember Allah during the Appointed Days.) means reciting the Takbir -- Allahu Akbar, Allahu Akbar, during the days of Tashriq after the compulsory prayers.
Imam Ahmad reported that `Uqbah bin `Amr said that Allah's Messenger said:
«يَوْمُ عَرَفَةَ، وَيَوْمُ النَّحْرِ، وَأَيَّامُ التَّشْرِيقِ، عِيدُنَا أَهْلَ الْإسْلَامِ، وَهِيَ أَيَّامُ أَكْلٍ وَشُرْب»
(The day of `Arafah (9th of Dhul-Hijjah), the day of the Sacrifice (10th) and the days of the Tashriq (11-12-13th) are our `Id (festival) for we people of Islam. These are days of eating and drinking.)
Imam Ahmad reported that Nubayshah Al-Hudhali said that Allah's Messenger said:
«أَيَّامُ التَّشْرِيقِ أَيَّامُ أَكْلٍ وشُرْبٍ وَذِكْرِ الله»
(The days of Tashriq are days of eating, drinking and Dhikr (remembering) of Allah.)
Muslim also recorded this Haith
We also mentioned the Hadith of Jubayr bin Mut`im:
«عَرَفَةُ كُلُّهَا مَوْقِفٌ، وَأيَّامُ التَّشْرِيقِ كُلُّهَا ذَبْح»
(All of `Arafat is a standing place and all of the days of Tashriq are days of Sacrifice. )
We also mentioned the Hadith by `Abdur-Rahman bin Ya`mar Ad-Diyli:
«وَأَيَّامُ مِنىً ثَلَاثَةٌ فَمَنْ تَعَجَّلَ فِي يَوْمَيْنِ فَلَا إثْمَ عَلَيْهِ وَمَنْ تَأَخَّرَ فَلَا إِثْمَ عَلَيْه»
(The days of Mina (Tashriq) are three. Those who hasten in two days then there is no sin in it, and those who delay (i.e., remain in Mina for a third day) then there is no sin in it.)
Ibn Jarir reported that Abu Hurayrah narrated that Allah's Messenger said:
«أَيَّامُ التَّشْرِيقِ أيَّامُ طُعْمٍ وَذِكْرِ الله»
(The days of Tashriq are days of eating and remembering Allah.)
Ibn Jarir reported that Abu Hurayrah narrated that Allah's Messenger sent `Abdullah bin Hudhafah to Mina proclaiming:
«لَا تَصُومُوا هذِه الْأَيَّامَ، فَإنَّهَا أَيَّامُ أَكْلٍ وَشُرْبٍ وَذِكْرِ اللهِ عَزَّ وَجَل»
(Do not fast these days (i.e., Tashriq days), for they are days of eating, drinking and remembering Allah the Exalted and Most Honored.)