أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ عَمَّارٍ، قَالَ حَدَّثَنَا الْمُعَافَى، - يَعْنِي ابْنَ عِمْرَانَ - عَنْ حَنْظَلَةَ بْنِ أَبِي سُفْيَانَ، عَنْ عِكْرِمَةَ بْنِ خَالِدٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَجُلاً، قَالَ لَهُ أَلاَ تَغْزُو قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " بُنِيَ الإِسْلاَمُ عَلَى خَمْسٍ شَهَادَةِ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَإِقَامِ الصَّلاَةِ وَإِيتَاءِ الزَّكَاةِ وَالْحَجِّ وَصِيَامِ رَمَضَانَ " .
It was narrated from Ibn 'Umar that: A man said to him: "Why don't you go out and fight?" He said: "I heard the Messenger of Allah [SAW] 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.'" Translation Not Available
Book Ref: Sunan An Nisai Book 47 Hadith 5001
Web Ref: Sunan An Nisai Vol 6 Book 47 Hadith 5004