Hadith # 8 Foundations of the Sunnah.
الْإِسْلَامُ أَنْ تَشْهَدَ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَتُقِيمَ الصَّلَاةَ وَتُؤْتِيَ الزَّكَاةَ وَتَصُومَ رَمَضَانَ وَتَحُجَّ الْبَيْتَ إِنْ اسْتَطَعْتَ إِلَيْهِ سَبِيلًا
Translation:-
Islam is to witness that there is no God but Allah and Muhammad is the Messenger of Allah, to establish prayer, to give the alms, the fast the month of Ramadan, and to perform pilgrimage to the House if he is capable of travel.