Hazrat Yazid bin Bishr al-Saksaki (may Allah have mercy on him) says that when I came to Madinah, I presented myself before Hazrat Abdullah bin Umar (may Allah be pleased with them both). Then a man from among the people of Iraq came to him and said: O Abdullah! What has happened to you that you only perform Hajj and Umrah and have abandoned striving in the path of Allah? He (may Allah be pleased with him) replied: Woe to you, the foundation of faith is built upon five things: that you worship Allah, establish prayer, pay zakat, perform Hajj to the House of Allah, and fast in Ramadan. The narrator says he asked the same question again, so he (may Allah be pleased with him) replied: O servant of Allah! Faith is that you worship Allah, establish prayer, pay zakat, perform Hajj to the House of Allah, and fast in Ramadan. The narrator says he repeated the question again, so he (may Allah be pleased with him) replied: O servant of Allah, faith is that you worship Allah, establish prayer, pay zakat, perform Hajj to the House of Allah, and fast in Ramadan. The Messenger of Allah (peace and blessings be upon him) told us this in the same way.