A man said to him: "Why don't you go out and fight?" He said: "I heard the Messenger of Allah say: 'Islam is built on five (pillars): Testimony that there is none worthy of worship except Allah, establishing Salah, giving Zakah, Hajj, and fasting Ramadan.'"
Sunan an-Nasa'i Book 47, Hadith 17
← Previous Hadith A man asked the Messenger of Allah : "What quality of Islam is best?" He said: "To feed (the poor) and to say the Salam to whomever one knows and whomever one does not know."

Sunan an-Nasa'i Book 47, Hadith 16 Next Hadith → "We were with the Prophet in a gathering and he said: 'Give me your pledge that you will not associate anything with Allah, you will not steal and you will not have unlawful sexual relations'- and then he recited the Verse to them. 'Whoever among you fulfills this pledge, his reward will be with Allah, and whoever commits any of those actions and Allah, the Mighty and Sublime, conceals him, it is up to Allah: If He wills, He will punish him, and if He wills, He will forgive him."

Sunan an-Nasa'i Book 47, Hadith 18