Hadith 1:3
Muttafaqun 'alayh (Zubair `Aliza'i)
Ibn ‘Umar reported God's messenger as saying, “Islam is based on five things:
the testimony that there is no god but God and that Muhammad is His servant and messenger, the observance of the prayer, the payment of zakat , the Pilgrimage, and the fast during Ramadan.” (Bukhari and Muslim.)
وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " بُنِيَ الْإِسْلَامُ عَلَى خَمْسٍ: شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ وَإِقَامِ الصَّلَاةِ وَإِيتَاءِ الزَّكَاةِ وَالْحَجِّ وَصَوْمِ رَمَضَانَ "
Original Reference: Mishkat al-Masabih 4