Sahih Muslim
Sahih Muslim 16d
وَحَدَّثَنِي ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا حَنْظَلَةُ، قَالَ سَمِعْتُ عِكْرِمَةَ بْنَ خَالِدٍ، يُحَدِّثُ طَاوُسًا أَنَّ رَجُلاً، قَالَ لِعَبْدِ اللَّهِ بْنِ عُمَرَ أَلاَ تَغْزُو فَقَالَ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " إِنَّ الإِسْلاَمَ بُنِيَ عَلَى خَمْسٍ شَهَادَةِ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَإِقَامِ الصَّلاَةِ وَإِيتَاءِ الزَّكَاةِ وَصِيَامِ رَمَضَانَ وَحَجِّ الْبَيْتِ " .
Ibn Numayr narrated to me; my father narrated to us; Hanzalah narrated to us and said: I heard Ikrimah ibn Khalid relate to Tawus that a man said to Abdullah ibn Umar, ‘Will you not go on a military expedition?’ He replied, ‘I heard the Messenger of Allah (peace and blessings be upon him) say: “Islam is built upon five: bearing witness that there is no deity except Allah; establishing the prayer; giving zakat; fasting Ramadan; and making Pilgrimage to the House.”’