[22].Surah Al-Hajj [The Pilgrimage]: Ayat 25

Ayat 25. Verily! Those who disbelieve and hinder (men) from the Path of Allah, and from Al-Masjid-al-Harâm (at Makkah) which We have made (open) to (all) men (women), the dweller in it and the visitor from the country are equal there [as regards its sanctity and pilgrimage (Hajj and 'Umrah)]. And whoever inclines to evil actions therein or to do wrong (i.e. practice polytheism and leave Islamic Monotheism), him We shall cause to taste a painful torment.

[Tafseer] As to those who have rejected ((Allah)), and would keep back (men) from the Way of Allah, and from the Sacred Mosque, which We have made (open) to (all) men - equal is the dweller there and the visitor from the country - and any whose purpose therein is profanity or wrong-doing them will We cause to taste of a most Grievous Penalty. All these were enormities of which the Pagan clique in power in Makkah were guilty before and during the Hijrah.   

Hazrat Ibn Umar (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, "Islam is based on five (pillars): testifying that there is no true god except Allah and that Muhammad (PBUH) is His slave and Messenger; performing of Salat (Iqamat-as-Salat); the payment of Zakat; performing Hajj (pilgrimage) to the House [of Allah (Ka`bah)]; and Saum (fasting) during the month of Ramadan.'' 

[Al-Bukhari Book 01, Chapter 02, Hadith # 07] 

Lesson : as mentioned above in Surah Al-Hajj Ayat 25."the Path of Allah, and from Al-Masjid-al-Harâm (at Makkah) which We have made (open) to (all) men," In this Hadith, Islam has been compared to a building which rests on five pillars. As a building cannot stand without its foundation, similarly, Islam cannot exist without these pillars. For this reason, he who denies any one of these obligations is a disbeliever, and he who neglects any of them due to slackness or want of attention is a sinful and impious Muslim.