Hadith Number 003 : The Authority Of Ibn Omar, the son of Omar bin Al-Khattab
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I heared the messenger of Allah say :
"Islam has been built on five [pillars]: testifying that there is no god but Allah and that Muhammed is the messenger of Allah, performing the prayers, paying the zakat, making the pilgrimage to the House, and fasting in Ramadan."
Bukhari and Muslim.