Here in the speech Dr shahib explain about the third  hadith from the book. 

On the authority of Abdullah ibn Umar ibn Al-Khattab (may Allah be pleased with him) who said: I heard the Messenger of Allah (peace be upon him) say:

Islam has been built on five [pillars]: testifying that there is no god but Allah and that Muhammad is the Messenger of Allah, performing the prayers, paying the Zakah, making the pilgrimage to the House, and fasting in Ramadan.

[Bukhari & Muslim]