Abu Suwaid Abdi says that once we went to the service of Sayyiduna Ibn Umar (may Allah be pleased with them both) and sat at the door of his house waiting for permission. When the permission was delayed, I started peeking through a hole in the door of his house. Sayyiduna Ibn Umar (may Allah be pleased with them both) found out. So when we were granted permission and went inside and sat down, he said: Just now, who among you peeked into the house? I admitted it. He said: How did it become lawful for you to peek into my house? I said: When the permission was delayed, I looked, and that too not intentionally. After that, the companions asked him some questions. He said: I heard the Prophet (peace and blessings be upon him) say: Islam is built on five things: bearing witness that there is no god but Allah and that Muhammad (peace and blessings be upon him) is the Messenger of Allah, establishing prayer, giving zakat, performing Hajj to the House of Allah, and fasting in Ramadan. I said: O Abu Abdur Rahman! What do you say about jihad? He said: Whoever strives, he strives for himself.