Shaitaan sticks to the heart of the child of Adam. When he does Zikr of Allah, he (Shaitaan) runs away from him. And when the child of Adam becomes careless from the Zikr of Allah, the Shaitan begins to put was-wasah (evil suggestion​s) into his heart.” [Bukhari]

And your garments purify! [Al-Muddathir 74:4]

http://www.tafseeronline.com

And when the prayer has been concluded, disperse within the land and seek from the bounty of Allah , and remember Allah often that you may succeed.(62:10)

There is a polish for everything that takes away rust; and the polish for the heart is the remembrance of Allah.” (Bukhari)

http://www.boston.com/bigpicture/2011/11/the_hajj_and_eid_al-adha.html

Eid al-Adha (Arabic: عيد الأضحى‎ ‘Īd al-’Aḍḥá,”feast of sacrifice”) or “Festival of Sacrifice” or “Greater Eid” is an important religious holiday celebrated by Muslims worldwide to commemorate the willingness of Abraham (Ibrahim) to sacrifice his son Ishmael (Isma’il) as an act of obedience to God, before God intervened to provide him with a sheep— to sacrifice instead.[1]

Eid al-Adha is the latter of two Eid festivals celebrated by Muslims, whose basis comes from Sura 2 (Al-Baqara) Ayah 196 in the Qur’an.[2] Like Eid ul-Fitr, Eid al-Adha begins with a Sunnah prayer of two Raka’ah (units) followed by a sermon (khuṭbah).

The word “Eid” appears in Sura al-Mai’da (“The Table Spread,” Chapter 5) of the Qur’an, meaning ‘solemn festival’.[3]

Eid al-Adha is celebrated annually on the 10th day of the 12th and the last Islamic month of Dhu al-Hijjah (ذو الحجة) of the lunar Islamic calendar.[4] Eid al-Adha celebrations start after the Hajj, the annual pilgrimage to Mecca in Saudi Arabia by Muslims worldwide, descend from Mount Arafat. The date is approximately 70 days (2 Months & 10 days) after the end of the month of Ramadan, i.e. Eid-ul-Fitr. Ritual observance of the holiday lasts until sunset of the 13th day of Dhu al-Hijjah.[5]

“Fasting the Day of ʿArafah [9th of Dhul-Ḥijjah] is an expiation for [all the sins of] the previous year and an expiation for [all the sins of] the coming year.”

[Ṣaḥīḥ al-Muslim]

And your Lord says, “Call upon Me; I will respond to you.” Indeed, those who disdain My worship will enter Hell [rendered] contemptible.(40:60)

[He has made it] straight, to warn of severe punishment from Him and to give good tidings to the believers who do righteous deeds that they will have a good reward.(18:2)

The history of the rituals of Hajj and ‘Umrah begins with the declaration of Abraham (sws) , Never did these rituals cease to be offered thereafter. Before the advent of the Prophet Muhammad (sws) also, the people of Arabia would come to offer them in multitudes and after his advent too, this process has continued. No doubt, the Arabs had introduced certain innovati…ons in these rituals; however, it is evident from historical narratives that certain people among them were fully aware of these innovations and would offer Hajj according to the way prescribed by Abraham (sws). It is narrated about the Prophet (sws) that before he was assigned Prophethood, he was spotted in ‘Arafat by Jubayr Ibn Mut‘im. He was surprised on this because the people of Quraysh would not go beyond Muzdalifah while the Prophet (sws) had come as far as ‘Arafat. He says:

أَضْلَلْتُ بَعِيرًا لِي فَذَهَبْتُ أَطْلُبُهُ يَوْمَ عَرَفَةَ فَرَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَاقِفًا بِعَرَفَةَ فَقُلْتُ هَذَا وَاللَّهِ مِنْ الْحُمْسِ فَمَا شَأْنُهُ هَا هُنَا (بخارى , رقم: ١٦٦٤)
I lost my camel. On the day of ‘Arafah, while trying to locate it I went up to the field of ‘Arafat and found that Muhammad (sws) was standing there. I said to myself: ‘By God! He belongs to the Quraysh; then what he is doing here?’ (Bukhari, No: 1664)

“O mankind, your injustice is only against yourselves, [being merely] the enjoyment of worldly life. Then to Us is your return, and We will inform you of what you used to do.” [10:23]

http://www.youtube.com/watch?v=i9-_skJHPG4

Say: “Allah knows best how long they stayed. With Him is (the knowledge of) the unseen of the heavens and the earth. How clearly He sees, and hears (everything)! They have no Wali (Helper, Disposer of affairs, Protector, etc.) other than Him, and He makes none to share in His Decision and His Rule.”

قُلِ ٱللَّهُ أَعْلَمُ بِمَا لَبِثُوا۟ ۖ لَهُۥ غَيْبُ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ۖ أَبْصِرْ بِهِۦ وَأَسْمِعْ ۚ مَا لَهُم مِّن دُونِهِۦ مِن وَلِىٍّۢ وَلَا يُشْرِكُ فِى حُكْمِهِۦٓ أَحَدًۭا