Five pillars of Islam. 

Islam has been built on five pillars testifying that. There is no deity worthy of worship except Allah and that Muhammad is the Messenger of Allah. Establishing the Salaah [Prayer]. Paying the Zakaah[obligatory charity].Making the Hajj [pilgrimage] to the House and Fasting in Ramadaan. 

[Hadith: Bukhari, Muslim] 

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Why you forget it? 

​(أَتَأْمُرُونَ النَّاسَ بِالْبِرِّ وَتَنْسَوْنَ أَنْفُسَكُمْ وَأَنْتُمْ تَتْلُونَ الْكِتَابَ ۚ أَفَلَا تَعْقِلُونَ)

Do you order righteousness of the people and forget yourselves while you recite the Scripture? Then will you not reason?
[Qur’an, 2-44]